Gray-shade pass card reader

Details Gray-shade pass card reader Gray-shade pass card reader

1998-02-12

2000-09-05

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235469, G06K 710

Patent

active

061129917

ABSTRACT:
A card reader for color cells, calibration and indicia cells are provided.

REFERENCES:
patent: 3761700 (1973-09-01), Patel et al.
patent: 3836754 (1974-09-01), Toye et al.
patent: 4259569 (1981-03-01), Passer et al.
patent: 4443694 (1984-04-01), Sanford
patent: 4705938 (1987-11-01), Stockburger et al.
patent: 5525798 (1996-06-01), Berson et al.

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