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Featured researches published by William A. Riddell.


Archive | 1942

Photoflash synchronizing device

William A. Riddell


Archive | 1937

Diaphragm control mechanism

William A. Riddell


Archive | 1939

Ratchet cable release

William A. Riddell


Archive | 1934

Folding projection screen

William A. Riddell


Archive | 1945

Aerial camera shutter

William A. Riddell


Archive | 1926

Case for photographic shutters

William A. Riddell


Archive | 1942

Camera shutter cover

Newton B Green; William A. Riddell


Archive | 1941

Focusing stop for shutters

William A. Riddell


Archive | 1938

Shutter trigger latch

William A. Riddell


Archive | 1935

Automatic film-threading control

William A. Riddell

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