Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor (working by grinding or polishing B24; for artistic purposes B44B)

Child Classifications

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• B28D 5/0005
• B28D 5/0058
• B28D 5/02 by rotary tools, e.g. drills
• B28D 5/04 by tools other than rotary type, e.g. reciprocating tools