Professors · Engineering
Prof. Dr.-Ing. Cornelius Frithjof Hahlweg
Professor of Electrical Engineering, Physics, Materials, Strength of Materials and Control Engineering – an internationally recognised expert in optics and scattered-light metrology with 46 patents and patent applications.
EngineeringElectrical Engineering, Physics, Materials, Strength of Materials and Control Engineering
Profile
RoleProgram Director Engineering (ING)
Teaching and subject areaElectrical Engineering, Physics, Materials, Strength of Materials and Control Engineering
DepartmentEngineering
At the university since1 September 2010
Prof. Dr.-Ing. Cornelius Frithjof Hahlweg has been a full-time lecturer at bbw University since September 2010 and heads its engineering degree programmes. He earned his doctorate at Helmut Schmidt University Hamburg on non-goniometric scattered-light metrology and is, among other roles, co-chair of the annual SPIE conference “Novel Optical Systems, Methods and Applications” in San Diego.
Academic Background
- 06/21: Occupational safety specialist, UVT VBG, Verwaltungsberufsgenossenschaft; since 06/26 also BGN (food and hospitality)
- 12/07: Doctorate (Dr.-Ing.), Helmut Schmidt University – Bundeswehr University Hamburg; dissertation topic: non-goniometric scattered-light metrology
- 10/92–06/98: Electrical engineering studies, TU Ilmenau, specialisation in information technology / microwave engineering; diploma thesis on scattering of mm-waves on rough surfaces; degree: Diplom-Ingenieur
Professional Career
- 03/2015–02/2019: NBS – Northern Business School, Hamburg, programme director of the bachelor's programme in Mechanical Engineering/Mechatronics
- 03/2011: Appointment as professor
- since 09/2010: bbw University, Berlin, employed university lecturer
- 01/2009–08/2010: bbw University Berlin, Hamburg branch, freelance lecturer
- 01/2008–12/2013: Helmut Schmidt University – Bundeswehr University Hamburg, research associate
- 08/2007–12/2007: SPE – Spezial Projektierung & Entwicklung GmbH, Zingst, development engineer
- 07/2001–07/2007: Helmut Schmidt University – Bundeswehr University Hamburg, research assistant
- 02/2001–05/2001: Harman / Becker Automotive Systems, Ittersbach, development engineer
- 07/1998–01/2001: Robert Bosch GmbH, Hildesheim, development engineer
- 07/1997–09/1997: Viptronic GmbH, Brixen/Italy, staff member in measuring instrument development
Memberships & Functions in Committees and Associations
- Member of SPIE – the international society for optics and photonics
- Co-chair of SPIE Novel Optical Systems, Methods and Applications (annual conference within the S+P Symposium, San Diego, CA)
- Co-chair of the SPIE Optical Engineering Symposium (annually in San Diego, CA)
- Member of the German Defence Technology Society (DWT e.V.)
- Head of the DWT e.V. working group on optics and optronics, organising a biennial conference
Awards, Scholarships, Honours & Patents
- 46 patents and patent applications; for details see www.dpma.de
Exhibitions, Conference Contributions & Lectures
- Organisation of the biennial conference of the DWT e.V. working group on optics and optronics
- Co-chairing the annual SPIE Novel Optical Systems, Methods and Applications conference
- Co-chairing the annual SPIE Optical Engineering Symposium
Publications
- Joseph Mulley, Cornelius Hahlweg (editors/chairs): SPIE Proceedings Volume 13595, Novel Optical Systems, Methods, and Applications XXVIII, 2025
- Cornelius F. Hahlweg: Aufklärung, Wirkung, Schutz: Perspektiven in der berufsintegrierenden und dualen Hochschulausbildung; in Hardthöhen-Kurier Ausgabe 2/2025, Mittler Report Verlag GmbH 2025
- Ein Studiengang namens Sondertechnik? – Wir wollten nicht unnötig provozieren. Interview mit Cornelius Hahlweg, in Europäische Sicherheit und Technik Ausgabe 06/2025, Mittler Report Verlag GmbH 2025
- Christoph Fessler, Cornelius Hahlweg, Jan Laser, Carlo Martini, Witold Stypa: Optics, arts, and history continued: interaction with new master's degree program in electrical engineering; In Proc. SPIE 13128, Optics Education and Outreach VIII, 131280M (1 Oct 2024)
- Jan Laser, Cornelius Hahlweg: Modeling dynamic thermal systems with radiation exchange and distributed parameters using thermal-electrical analogy in construction; In Proceedings Volume 13130, Novel Optical Systems, Methods, and Applications XXVII; 1313004, (Oct 2024)
- Joseph Mulley, Cornelius Hahlweg (editors/chairs): Proceedings Volume 13130, Novel Optical Systems, Methods, and Applications XXVII; 1313004, (Oct 2024)
- Cornelius Hahlweg: Wehrtechnik in der akademischen Ausbildung: neue berufsbegleitende Studiengänge Mechatronik-Sondertechnik, in 12. Tagung des AK Optik und Optronik der DWT e.V. 2024
- Cornelius F. Hahlweg: Aufklärung, Wirkung, Schutz: Perspektiven in der Hochschulausbildung; Herbst-Symposium Förderkreis Deutsches Heer e.V. „Wirkung als Schlüssel für die Durchsetzungsfähigkeit von Landstreitkräften“ 24./25.10.2023, DND, 35708 Haiger, 2023
- Cornelius F. Hahlweg, Joseph R. Mulley: Proc. SPIE 12665, Novel Optical Systems, Methods, and Applications XXVI, 2023
- Cornelius Hahlweg, Witold Stypa: Optics, arts, and sound: celebrating 100 years of Kaluza's 5th dimension in a geographically distributed interactive hybrid exhibition; SPIE Proceedings Volume 12213, Optics Education and Outreach VII; 2022, Presentation + Paper 2022
- Cornelius F. Hahlweg, Joseph R. Mulley: Proc. SPIE 12216, Novel Optical Systems, Methods, and Applications XXV, 2022
- Simon Thibault, R. Barry Johnson, Joseph Mulley, and Cornelius Hahlweg: Special Section Guest Editorial: Recent Advances in Lens Design and Optical Engineering, Optical Engineering 60(5), Journal
- Cornelius F. Hahlweg, Joseph R. Mulley: Proc. SPIE 11815, Novel Optical Systems, Methods, and Applications XXIV, 2021
- Cornelius F. Hahlweg, Joseph R. Mulley: Proc. SPIE 11483, Novel Optical Systems, Methods, and Applications XXIII, 2020
- Cornelius F. Hahlweg, Joseph R. Mulley: Proc. SPIE 11105, Novel Optical Systems, Methods, and Applications XXII, 2019
- Hahlweg, C., Rothe, H., Kaczmarkiewicz, M.: Kompendium der 10. Tagung des AK Optik und Optronik der DWT e.V. conference proceedings 2019
- Cornelius F. Hahlweg, Stefan Marschall, and Sebastian Schreiber: "Thermal modeling of facade and roof constructions using nonlinear equivalent circuit techniques: review and recent applications", Proc. SPIE 11105, Novel Optical Systems, Methods, and Applications XXII, 111050G (9 September 2019)
- Stefan Marschall, Nikolai Schedrick, and Cornelius F. Hahlweg: "Standard specifications vs metrology of LED illumination systems", Proc. SPIE 10746, Novel Optical Systems Design and Optimization XXI, 107460H (17 September 2018)
- Janine Brennförder and Cornelius Hahlweg: "Further development of an imaging inspection system for layered surfaces", Proc. SPIE 10746, Novel Optical Systems Design and Optimization XXI, 107460E (17 September 2018)
- Cornelius F. Hahlweg, Joseph R. Mulley: Proc. SPIE 10746, Novel Optical Systems Design and Optimization XXI, 1074601 (5 November 2018)
- Janine Brennförder, Cornelius Hahlweg: Implementing optics courses in dual engineering university programs: challenges and perspectives; in Gregory, G.: Proc. SPIE 10741, Optics Education and Outreach V; 2018
- Spezielle Abbildungsverfahren für digitale High-Speed-Video-Untersuchungen von Kurzzeitvorgängen. Hahlweg, C., Zhao, W. und Rothe, H. [Hrsg.] C. Hahlweg. Meppen: DWT e.V., 2017
- Kleeberg, F., Hahlweg, C., Weyer, C.: Untersuchungen zur Wahrnehmung von leistungsmoduliertem Licht im Zusammenhang mit akustischer Immission, in Rothe, H., Hahlweg, C.: Kompendium 9. Tagung Optik und Optronik der DWT 2017. Meppen, 2017
- Hahlweg, C., Jäger, Kai, Weyer, C., Weiß, J.: Generation of rhythm patterns from harmonic structures in power modulated light. Proc. SPIE 9948, Novel Optical Systems Design and Optimization XIX, 99480X. Arthur J. Davis; Cornelius F. Hahlweg; Joseph R. Mulley, 2016, Bd. 9948
- Davis, Arthur J. und Hahlweg, Cornelius F., Mulley, J.: Novel Optical Systems Design and Optimization XX. San Diego: SPIE, 2017. Bd. 10376. ISBN: 9781510612099
- Hahlweg, C. und Rothe, H.: Optics and optronics in university courses for officers of the Federal Armed Forces – special curricula and hands-on lessons vs. academic requirements. Proc. SPIE 9946, Optics Education and Outreach IV, 99460J. G. Groot Gregory, 2016, Bd. 9946
- Davis, Arthur J. und Hahlweg, Cornelius F., Mulley, J.: Novel Optical Systems Design and Optimization XIX.: Proceedings of SPIE, 2016. 9948
- Uebeler, D., Pescoller, L., Hahlweg, C.: Further developement of imaging near-field scatterometer; SPIE Proceedings 9579, Novel Optical Systems Design and Optimization XVIII, 2015
- Arthur J. Davis, G. Groot Gregory, Cornelius F. Hahlweg: Proc. SPIE 9579, Novel Optical Systems Design and Optimization XVIII, 957901 (14 September 2015)
- Dannenberg, F.; Hahlweg, C.: Extended volume and surface scatterometer for optical characterization of 3D-printed elements; SPIE Proceedings 9573, Optomechanical Engineering 2015
- Dannenberg, F.; Hahlweg, C.; Pescoller, L.: A rugged stereoscopical device for surface inspection; SPIE Proceedings 9576: Applied Advanced Optical Metrology Solutions; 2015
- Hahlweg, C.; Rothe, H.; Weyer, C.: A quintuple of painful lessons from surface inspection to high-speed imaging; in Kahan, M.: An Optical Believe It or Not: Key Lessons Learned IV.; (Proceedings of SPIE Vol. 9583) 2015
- Cornelius Hahlweg; Florian Dannenberg; Joachim Dörfler; Bernhard Weber; Cornelia Weyer; Harald Gercke-Hahn; Steffen Freimuth; Sören Heucke; Holger Ludwig Gutzmann: Chords and harmonies in mixed optical and acoustical stimuli, Proc. SPIE 9193, Novel Optical Systems Design and Optimization XVII, 91930P (September 11, 2014)
- Florian Dannenberg; Cornelius Hahlweg; Lukas Pescoller; Wenjing Zhao: Near-field imaging techniques for surface inspection: Proc. SPIE 9193, Novel Optical Systems Design and Optimization XVII, 91930Q (September 12, 2014)
- Florian P. Kleeberg; Holger L. Gutzmann; Cornelia Weyer; Jürgen Weiß; Joachim Dörfler; Cornelius F. Hahlweg: Investigation of correlation of LF power modulation of light in natural and artificial illumination situations and acoustic emission: Proc. SPIE 9190, Thirteenth International Conference on Solid State Lighting, 919003 (September 18, 2014)
- Hahlweg, C., Weyer, C., Gercke-Hahn, H., Gutzmann, H., Brahmann, A., Rothe, H.: Perception of power modulation of light in conjunction with acoustic stimulation, SPIE 8842-17, SPIE Optics and Photonics, San Diego 2013, Proceedings Volume 8842: Novel Optical Systems Design and Optimization XVI, October 2013
- Hahlweg, C., Zhao, W., Dörfler, J., Rothe, H.: Applied paraxial methods and some philosophical questions, SPIE 8842-9, SPIE Optics and Photonics, San Diego 2013, Proceedings Volume 8842: Novel Optical Systems Design and Optimization XVI, October 2013
- Hahlweg, C., Pescoller, L., Zhao, W.: Inspection and characterization of flexo-printing plates, SPIE 8842-19, SPIE Optics and Photonics, San Diego 2013, Proceedings Volume 8842: Novel Optical Systems Design and Optimization XVI, October 2013
- Hahlweg, C, Rothe, H.: The Unique Sound of the Uni-Vibe pedal – Part II: transient behaviour, SPIE 8842-15, SPIE Optics and Photonics, San Diego 2013, Proceedings Volume 8842: Novel Optical Systems Design and Optimization XVI, October 2013
- Hahlweg, C., Skaloud, D., Gutzmann, H., Kutz, S., Rothe, H.: Visualization of sound generation – special imaging Techniques, SPIE 8842-16, SPIE Optics and Photonics, San Diego 2013, Proceedings Volume 8842: Novel Optical Systems Design and Optimization XVI, October 2013
- Hahlweg, C., Pescoller, L.: Design of scale distorting imaging devices with tilted object plane, SPIE Optics and Photonics, San Diego 2012, Proceedings Volume 8487: Novel Optical Systems Design and Optimization XV, October 2012
- Hahlweg, C., Rothe, H.: The unique sound of the Uni-Vibe pedal, SPIE Optics and Photonics, San Diego 2012, Proceedings Volume 8487: Novel Optical Systems Design and Optimization XV, October 2012
- Hahlweg, C., Wilhelm, E., Schael, U., Rothe, H.: Wechselwirkungen von stromdurchflossenen Leitern und Wirkmittelanordnungen, Symposium BFT 2011 Ballistik in Forschung und Technologie, 19.–21.09.2011, Bundesakademie für Wehrverwaltung und Wehrtechnik Mannheim
- Hahlweg, C., Zhao, W., Vogeler, H., Rothe, H.: Imaging of short time microscopic scenes with strong light emission: revisited, SPIE Optics and Photonics, San Diego 2012, Proceedings Volume 8466: Instrumentation, Metrology, and Standards for Nanomanufacturing, Optics, and Semiconductors VI, October 2012
- Hahlweg, C., Zhao, W., Rothe, H.: Uranium glass in optics: historical review and current research, SPIE Optics and Photonics, San Diego 2012, Proceedings Volume 8487: Novel Optical Systems Design and Optimization XV, October 2012
- Zhao, W., Hahlweg, C., Rothe, H.: Surface characterization using combined analysis of original and scatter image, SPIE Optics and Photonics, San Diego 2012, Proceedings Volume 8495: Reflection, Scattering, and Diffraction from Surfaces III, September 2012
- Zhao, W., Hahlweg, C., Rothe, H.: Design of combined microscopical and scatterometrical imaging device of surface inspection, SPIE Optics and Photonics, San Diego 2012, Proceedings Volume 8495: Reflection, Scattering, and Diffraction from Surfaces III, September 2012
- Chalupka, U., Hahlweg, C., Rothe, H.: "Backscatter behaviour and tracking of ogive shaped objects in optical range" in Signal and Data Processing of Small Targets 2011, edited by Oliver E. Drummond, Proceedings of SPIE Vol. 8137 (SPIE, Bellingham, WA 2011) 813705
- Hahlweg, C., Rothe, H.: "Lambert's multiple reflection model revisited", SPIE Optics and Photonics, San Diego 2011, in Optical Modeling and Performance Predictions V, edited by Mark A. Kahan, Proceedings of SPIE Vol. 8127 (SPIE, Bellingham, WA 2011) 812707
- Hahlweg, C., Zhao, W., Rothe, H.: "Fourier planes vs. Scheimpflug principle in microscopic and scatterometric devices", SPIE Optics and Photonics, San Diego 2011, in Optical Modeling and Performance Predictions V, edited by Mark A. Kahan, Proceedings of SPIE Vol. 8127 (SPIE, Bellingham, WA 2011) 812708
- Zhao, W., Hahlweg, C., Rothe, H.: "Verification of scatterometer design" in Instrumentation, Metrology, and Standards for Nanomanufacturing, Optics, and Semiconductors V, SPIE Optics and Photonics, San Diego 2011, edited by Michael T. Postek, Proceedings of SPIE Vol. 8105 (SPIE, Bellingham, WA 2011) 810509
- Hahlweg, C., Wilhelm, E., Rothe, H.: "Laser based imaging of time depending microscopic scenes with strong light emission", SPIE Optics and Photonics, San Diego 2011, in Instrumentation, Metrology, and Standards for Nanomanufacturing, Optics, and Semiconductors V, edited by Michael T. Postek, Proceedings of SPIE Vol. 8105 (SPIE, Bellingham, WA 2011) 81050J
- Hahlweg, C., Köster, A., Wilhelm, E., Claussen, P., Schael, U., Rothe, H.: Theoretische und experimentelle Untersuchungen an zylindrischen und anderen Hohlladungen, Symposium BFT 2011 Ballistik in Forschung und Technologie, 19.–21.09.2011, Bundesakademie für Wehrverwaltung und Wehrtechnik Mannheim
- Hahlweg, C.; Rothe, H.: Untersuchungen zu Verfahren der elektrischen Panzerung gegen harte/passive Projektile, Vortrag zum Symposium BFT 2009 Ballistik in Forschung und Technologie, 26.–28.10.2009, Bundesakademie für Wehrverwaltung und Wehrtechnik Mannheim
- C. Hahlweg, B. Meißner, W. Zhao and H. Rothe: The idea of the Lambertian surface – history, idealization and system theoretical aspects and part 1 of a lost chapter on multiple reflection, SPIE San Diego, August 2010, SPIE Optics and Photonics, San Diego 2010, SPIE Proc. 7792
- C. Hahlweg, B. Meißner, W. Zhao and H. Rothe: Time depending techniques for volume and discrete boundary surface scatterometry and part II of a lost chapter in Lambert's Photometria, SPIE San Diego, August 2010, SPIE Optics and Photonics, San Diego 2010, SPIE Proc. 7792
- Eugen Wilhelm, Cornelius Hahlweg, Uwe Chalupka, Wenjing Zhao and Hendrik Rothe: A stereoscopic imaging system for laser back-scatter based trajectory measurement in ballistics, SPIE San Diego, August 2010, SPIE Optics and Photonics, San Diego 2010, SPIE Proc. 7792
- Wenjing Zhao, Cornelius Hahlweg and Hendrik Rothe: Investigations on back scatter of typical projectiles for application of laser based trajectory measurement, SPIE San Diego, August 2010, SPIE Optics and Photonics, San Diego 2010, SPIE Proc. 7792
- Wenjing Zhao, Cornelius Hahlweg and Hendrik Rothe: Design rules for catadioptric scatterometers based on measurement requirements, SPIE San Diego, August 2010, SPIE Optics and Photonics, San Diego 2010, SPIE Proc. 7792
- Hahlweg, C.; Gruhlke, M.; Rothe, H.: Nonlinear distortion in atomic force microscopy (AFM) measurements, Nanoscale 2008, Sept 22nd & 23rd, 2008 Turin, Italien, Meas. Sci. Technol. *20* 084018 (2009)
- Hahlweg, C.; Rothe, H.: Macroscopical scatter and reflection behavior of convex bodies in free flight, SPIE San Diego, August 2009, Remote Sensing System Engineering II, Proc. SPIE 7458
- Hahlweg, C.; Rothe, H.: Spectral effects of AFM tip geometry, SPIE San Diego, August 2009, Instrumentation, Metrology, and Standards for Nanomanufacturing III, Proc. SPIE 7405
- Hahlweg, C.; Rothe, H.: Non-linear distortions caused by AFM-tip geometry and limitations of reconstruction on discrete data, SPIE San Diego, August 2009, Instrumentation, Metrology, and Standards for Nanomanufacturing III, Proc. SPIE 7405
- Hahlweg, C.; Rothe, H.: Rückstreuquerschnitte von Projektilen im optischen Bereich und Grundkonfigurationen für laserradargestützte Geschoßbahnvermessung / Scatter and reflection behavior of projectiles, Vortrag zum Symposium BFT 2009 Ballistik in Forschung und Technologie, 26.–28.10.2009, Bundesakademie für Wehrverwaltung und Wehrtechnik Mannheim
- Hahlweg, Cornelius F.: Nichtgoniometrische Streulichtmeßtechnik, Helmut-Schmidt-Universität, Universität der Bundeswehr Hamburg, 2008, Dissertation
- Hahlweg, C.; Rothe, H.: Optical compensation of macroscopical surface curvature in rough surface scatterometry, SPIE Europe, Glasgow, September 2008, Proc. SPIE 7102, Optical Fabrication, Testing and Metrology II
- Hahlweg, C.; Rothe, H.: Rough surface scatterometry of bodies with rotational symmetry, SPIE San Diego, August 2008, Proc. SPIE 7065, Reflection, Scattering, and Diffraction from Surfaces
- Hahlweg, C.; Rothe, H.: Utilization of the Scheimpflug-principle in scatterometer design, SPIE San Diego, August 2008, Proc. SPIE 7065, Reflection, Scattering, and Diffraction from Surfaces
- Hahlweg, C.; Rothe, H.: Theoretical and experimental investigations of non-goniometric scatterometry, "Proc. SPIE" 6672, Advanced Characterization Techniques for Optics, Semiconductors, and Nanotechnologies III, SPIE San Diego, CA, August 2007
- Hahlweg, C.; Rothe, H.: Non-goniometric scatterometry – A review, "Proc. SPIE" 6682, Polarization Science and Remote Sensing III, SPIE San Diego, CA, August 2007
- Hahlweg, C.; Rothe, H.: Spectroscopic Imaging from 400nm to 1800nm with Liquid Crystal tunable Filters, "Proc. SPIE" 6503, Machine Vision Applications in Industrial Inspection XV, SPIE/Electronic Imaging San Jose CA, Januar 2007
- Hahlweg, C.; Rothe, H.: Ein radiometrisch kalibrierbares multispektrales abbildendes System hoher Dynamik, Tagungsband 12. Farbworkshop 2006 Ilmenau, Oktober 2006
- Hahlweg, C.; Rothe, H.: Hemispherical radiometer for angle resolved measurement of IR scatter and radiation behaviour, "Proc. SPIE" 6396, Optics/Photonics in Security and Defence, Stockholm, September 2006
- Hahlweg, C.; Rothe, H.: Design of a full-hemispherical spectro-radiometer with high dynamic range for characterization of surface properties using multi-spectral BRDF data from VIS to NIR, Optical Fabrication, Testing and Metrology II, Jena, September 2005, 2005, 5965
- Hahlweg, C.; Rothe, H.: Classification of optical surface properties and material recognition using multi-spectral BRDF data measured with a semi-hemispherical spectro-radiometer in VIS and NIR, Optical Fabrication, Testing and Metrology II, Jena, September 2005, 2005, 5965
- Hahlweg, C.; Rothe, H.: Multispektrales Kamerasystem 400nm–1100nm mit LCTF als programmierbaren Filterelementen, Vortragsband zur 3. Tagung Optik und Optronik in der Wehrtechnik, Hendrik Rothe, Helmut-Schmidt-Universität/Universität der Bundeswehr Hamburg, Wehrtechnische Dienststelle für Waffen und Munition, Meppen, September 2005
- Hahlweg, C.; Rothe, H.: Calibration procedures and measurement results of a fast semi-hemispherical spectro-radiometer in VIS and NIR, Imaging Spectrometry X, Denver, August 2004, 2004, 5546
- Hahlweg, C.; Rothe, H.: Design of a semi-hemispherical spectro-radiometer for fast acquisition of BRDF libraries in VIS and NIR, Imaging Spectrometry X, Denver, August 2004, 2004, 5546
- Hahlweg, C.: Nichtlineares System zur breitbandigen Rauscherzeugung, Informations- und Systemtheorie, Wellenausbreitung, Integrierte Systeme, T-Nova Deutsche Telekom Innovationsgesellschaft mbH, 1999, 43
- Hahlweg, C.: Abbildung von mm-Wellen an Oberflächen mit eindimensionaler Höhenänderung – systemtheoretische Aspekte, Informations- und Systemtheorie, Wellenausbreitung, Integrierte Systeme, Deutsche Telekom AG, 1998, 42
- Hahlweg, C.: Streuung von mm-Wellen an rauen Oberflächen, Technische Universität Ilmenau, Fakultät für Elektrotechnik und Informationstechnik, 1998, Diplomarbeit
- Hahlweg, C.: Millimeterwellen-Scanner, Technische Universität Ilmenau, Fakultät für Elektrotechnik und Informationstechnik, 1997, Studienarbeit
- Hahlweg, C.; Loele, H.: Steuung von mm-Wellen-Funkstrahlen an zeitlich veränderlichen Beugungsgittern, Informations- und Systemtheorie, Wellenausbreitung, Integrierte Systeme, Deutsche Telekom AG, 1997, 41
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