Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B44
DECORATIVE ARTS
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B44C
PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
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1/00
Processes, not specifically provided for elsewhere, for producing decorative surface effects
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B44C1/22
Removing surface-material, e.g. by engraving, by etching
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B44C1/221
using streams of abrasive particles
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