Top IPC subclasses
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1
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F16H
|
7
|
gearing
|
|
2
|
B23H
|
4
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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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|
3
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B23F
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1
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making gears or toothed racks
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4
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F03B
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1
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machines or engines for liquids
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5
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B60G
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1
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vehicle suspension arrangements
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6
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G01N
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1
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Investigating or analysing materials by determining their chemical or physical properties
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|
7
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E21B
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1
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earth or rock drillingobtaining oil, gas, water, soluble or meltable materials or a slurry of minera
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8
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G01M
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1
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testing static or dynamic balance of machines or structurestesting structures or apparatus not other
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