Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B41
PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
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B41P
INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
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2233/00
Arrangements for the operation of printing presses
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B41P2233/50
Marks on printed material
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B41P2233/51
for colour quality control
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