Hugo Wehrenfennig

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US Patent 2,643,581.

E. Leitz Photographic Patents by Hugo Wehrenfennig

1951 JAN 18 - BAYONET UNION FOR CAMERA OBJECTIVE PARTS
1951 APR 17 - CAMERA WINDING KEY with Ludwig Leitz
1951 JUL 25 - FILM CONTAINER FOR ROLL FILM CAMERA with Ludwig Leitz

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