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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G06K7/02
by pneumatic or hydraulic means, e.g. sensing punched holes with compressed air; by sonic means; ; by ultrasonic means
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