Top IPC subclasses
1
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B24B
|
2
|
machines, devices, or processes for grinding or polishingdressing or conditioning of abrading surfac
|
2
|
F25B
|
2
|
refrigeration machines, plants, or systemscombined heating and refrigeration systemsheat pump system
|
3
|
F03B
|
1
|
machines or engines for liquids
|