Inventor

BUTTS WILLIAM O

2 patents

Patents

2 patents

US4115869ASep 19, 1978

Methods and apparatus for processing data including a characteristic mark or error

BELL & HOWELL CO4 citations49

US4037239AJul 19, 1977

Microfilm camera and photographic film handling apparatus with an actuable film clamping device

BELL & HOWELL CO1 citations45