Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Counting based on number of times machine or apparatus operates
Patent
1989-10-16
1991-05-14
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Counting based on number of times machine or apparatus operates
206 081, 206 083, 206459, D17 24, G08B 1308, G07D 1300, G06M 122
Patent
active
050162624
ABSTRACT:
A portable apparatus suitable for use by a waitress for carrying money and making change which includes a signaling device for emitting a signal each time the apparatus is opened. The apparatus also includes a counter which counts and records the number of times the apparatus is opened.
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patent: 2053599 (1936-09-01), Brinkerhoff
patent: 2296989 (1942-09-01), Forsyth
patent: 2959274 (1960-11-01), Moss et al.
patent: 4553252 (1985-11-01), Egendorf
patent: 4688023 (1987-08-01), McGill
Brunton James E.
Heyman John S.
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