Top IPC subclasses
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1
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B23F
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4
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making gears or toothed racks
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2
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C21D
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3
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modifying the physical structure of ferrous metalsgeneral devices for heat treatment of ferrous or n
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3
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B23B
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2
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turningboring
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4
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B24D
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2
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tools for grinding, buffing, or sharpening
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5
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B24B
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2
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machines, devices, or processes for grinding or polishingdressing or conditioning of abrading surfac
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6
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C23C
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2
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Coating metallic material; coating material with metallic material; surface treatment of metallic material by diffusion into the surface, by chemical conversion or substitution; coating by vacuum evaporation, by sputtering, by ion implantation or by chemical vapour deposition, in general
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7
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B21H
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1
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making particular metal objects by rolling, e.g. screws, wheels, rings, barrels, balls
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