Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1975-12-01
1977-11-01
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250571, 250239, 209DIG2, G06K 500, G06K 1100
Patent
active
040567311
ABSTRACT:
The reticle of a paper currency validating device of the type which uses a radiation sensing system is protected by the provision of a thin sapphire disc covering the reticle.
REFERENCES:
patent: 3457421 (1969-07-01), Bayha
patent: 3564268 (1971-02-01), Bayne
patent: 3581100 (1971-05-01), Milford
ARDAC/USA
Moore David K.
Smith Alfred E.
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