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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1/00
Methods or arrangements for marking the record carrier in digital fashion
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G06K1/12
otherwise than by punching
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G06K1/128
by electric registration, e.g. electrolytic, spark erosion
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