Question: What Japanese brand-name lens was used between 1940 and 1980 by the German camera company founded by Ernst Leitz?
Sentence (from "Leica copies"): The design was carried out by Oskar Barnack, beginning in 1913 by building a camera for "24×36 mm" negatives that by now is called the "Ur-Leica"; but Ernst Leitz did not decide to manufacture it until 1924.
Relevant evidence: No