Top IPC subclasses
1
|
F03D
|
4
|
Wind motors
|
2
|
C12M
|
2
|
apparatus for enzymology or microbiology
|
3
|
C02F
|
2
|
Treatment of water, waste water, sewage, or sludge
|
4
|
F24J
|
1
|
Production or use of heat not otherwise provided for
|
5
|
E04H
|
1
|
buildings or like structures for particular purposesswimming or splash baths or poolsmastsfencingten
|