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Koch, Ludwig Karl (1881–1974), broadcaster and sound recordist, was born on 13 November 1881 at Eschersheimer Landstrasse 20, Frankfurt am Main, Germany, the second of the three children of Karl Theodor Koch, businessman, and his wife, Auguste Hess. Ludwig Koch's parents, both of whom were Jews, were enthusiastic music-lovers who introduced him into ...

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Marconi, Guglielmo (1874–1937), physicist and inventor of wireless transmission, was born on 25 April 1874 in Bologna, Italy, the son of Giuseppe Marconi (1826–1904), a local administrator and landowner, and his second wife, Annie (b. c.1843), daughter of Andrew Jameson of the notable Irish family of whiskey distillers. Owing to his poor health ...