October - The Wall Street Crash of 1929 marks a major turning point in Germany: following prosperity under the government of the Weimar Republic, foreign investors withdraw their German interests, beginning the crumbling of the Republican government in favor of Nazism.[1] The number of unemployed reaches three million.[2]
German car company Opel is taken over by American company General Motors. General Motors assumed full control in 1931.
Date unknown - Clinical application of cardiac catheterization begins with German physician Werner Forssmann in 1929, who inserted a catheter into the vein of his own forearm, guided it fluoroscopically into his right atrium, and took an X-ray picture of it.
^Lee, Stephen (1996). Weimar and Nazi Germany. London: Heinemann. pp. 38–39. ISBN 0-435-30920-X.
^Gilbert, Martin (1998). A History of the Twentieth Century. New York: Avon Books. ISBN 0-380-71393-4.
^Kalb, Jonathan (2001). The theater of Heiner Müller. New York: Limelight Editions. p. 1. ISBN 9780879109653.
^"John C. Polanyi – Biography". The Nobel Foundation. Retrieved 31 March 2011.
^Klaus Marxen; Gerhard Werle (2004). Strafjustiz und DDR-Unrecht: Spionage. De Gruyter. ISBN 978-3-89949-080-0.
^Christa Wolf obituary, Kate Webb, The Guardian, 1 December 2011
^Billboard. Nielsen Business Media, Inc. 19 May 1973. p. 38.
^Donahue, Patrick (5 October 2007). "German Writer, Chronicler Walter Kempowski Dies at Age 78". Bloomberg.com. Archived from the original on 19 October 2012. Retrieved 5 October 2007.
^Grimes, William. "Ralph Dahrendorf, Sociologist, Dies at 80 ", The New York Times, 22 June 2009. Accessed 10 October 2009.
^"Falleció Pedro Trebbau, reconocido zoólogo venezolano de origen alemán". El Nacional (in Spanish). 16 January 2021. Retrieved 17 January 2021.
^Long, Brian (2015). Mercedes-Benz SLK R171 series : 2004-2011. Dorcester, England: Veloce Publishing. p. 14. ISBN 9781845846534.
^Warrack, John (1996). The concise Oxford dictionary of opera. Oxford New York: Oxford University Press. p. 234. ISBN 9780192800282.
^Magill, Frank (1990). Great lives from history. Pasadena, Calif: Salem Press. p. 332. ISBN 9780893565664.