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It was used in various Voigtländer folding camera pre-WW2 era, 1930s, like Inos (1933-1935), Voigtländer Rollfilm (1927-1932), Perkeo 3x4 (1931-35) etc. It is a two leaf auto working shutter, does not need setting, shutter release and cocking lever is the same lever. Its speeds are 1/25, 1/50, 1/100 +T