Patent classifications
G
PHYSICS
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G06
COMPUTING OR CALCULATING; COUNTING
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G06K
GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
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7/00
Methods or arrangements for sensing record carriers,; e.g. for reading patterns;
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G06K7/10
by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
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G06K7/12
using a selected wavelength, e.g. to sense red marks and ignore blue marks
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