The company also produced other instruments in the 1920s and 1930s, including polarising and fluorescent microscopes. Oskar Barnack designed a camera that used 35mm film and Max Berek was responsible for the lenses. He launched the Leica 0, a combination of designs by 2 of his employees, in 1925. Leitz II revolutionised photography by expanding the company’s product range to include portable cameras under the name Leica (an abbreviation of Lei(tz) ca(mera)). Ernst Leitz I died in 1920, and the company passed to his 2 nd son, Ernst Leitz II. The First World War had severe economic consequences for the company. They sold their 10,000 microscope in 1887, and in 1907, Robert Koch took delivery of the 100,000 th. He introduced serial production and sales increased rapidly after 1871. By 1869, he owned it outright and continued in business under his own name. After Kellner’s death in 1855, Leitz became the main shareholder in the company. When Leitz joined Carl Kellner’s Optical Institute in Wetzlar 1864, he was an instrument maker trained in making physical and chemical apparatus, and also had several years experience making Swiss watches.
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