Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-02-21
1992-01-28
Fields, Carolyn E.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502221, 453 4, 379148, H04M 1702, G07F 304
Patent
active
050846132
ABSTRACT:
A circuit operated in response to deposit of a coin through a trigger switch to selectively operate one of a plurality of signal generators. When coins are deposited through said coin trigger switch, blocking light from a light source to a light detection means, an associated signal driver activates a selected tone signal generator.
REFERENCES:
patent: 3680566 (1972-08-01), Tanuka et al.
patent: 4436103 (1984-03-01), Dick
patent: 4988860 (1991-01-01), Wollet et al.
Black Robert J.
Fields Carolyn E.
Quadrum Telecommunications Inc.
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