B
PERFORMING OPERATIONS; TRANSPORTING
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B28
WORKING CEMENT, CLAY, OR STONE
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B28D
WORKING STONE OR STONE-LIKE MATERIALS
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B28D5/00
Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
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B28D5/04
by tools other than rotary type, e.g. reciprocating tools
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B28D5/045
by cutting with wires or closed-loop blades
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