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PCE
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CPC Subgroup
B28D 1/30

to form contours, i.e. curved surfaces, irrespective of the method of working used (for artistic purposes B44B)

Full Title

Working stone or stone-like materials, e.g. brick, concrete , not provided for elsewhere; Machines, devices, tools therefor (fine working of gems, jewels, crystals B28D5/00; working by grinding or polishing B24; devices or means for dressing or conditioning abrasive surfaces B24B53/00) > to form contours, i.e. curved surfaces, irrespective of the method of working used (for artistic purposes B44B)