Top IPC subclasses
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1
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B21H
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5
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making particular metal objects by rolling, e.g. screws, wheels, rings, barrels, balls
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2
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B21D
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4
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working or processing of sheet metal or metal tubes, rods or profiles without essentially removing m
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3
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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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4
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F03B
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2
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machines or engines for liquids
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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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F16H
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1
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gearing
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8
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B62D
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1
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motor vehiclestrailers
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9
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B30B
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1
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presses in generalpresses not otherwise provided for
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10
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B23H
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1
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Working of metal by the action of a high concentration of electric current on a workpiece using an electrode which takes the place of a tool; such working combined with other forms of working of metal
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