Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B41
PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
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B41M
PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING,
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3/00
Printing processes to produce particular kinds of printed work, e.g. patterns
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B41M3/146
using a non human-readable pattern which becomes visible on reproduction, e.g. a void mark
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