Perforated member sensing mechanisms
United States Patent 2796476
US Patent References:
Switching device
- - 2137131


Inventors:
WEST CHARLES F
Publication Date:
06/18/1957
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Assignee:
SOROBAN ENGINEERING INC
Primary Class:
235/442
Other Classes:
235/486, 235/443, 178/17A, 235/61J