NASA NTRS · 19820018752
Film advance indicator
Abstract
A film advancement indicator which includes an optical sensor that detects the rotational movement of a disc that rotates only when the film advance is described. When the film does not advance, an indicator light is activated. A counter is included in the electronic circuit to determine the number of film frames advanced.
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Freeman, E. T., Stump, C. W., Dreisbach, F. W.. 1982-01-19. Film advance indicator. https://ntrs.nasa.gov/citations/19820018752
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