Top IPC subclasses
1
|
F24J
|
8
|
Production or use of heat not otherwise provided for
|
2
|
F24D
|
3
|
domestic- or space-heating systems, e.g. central heating systemsdomestic hot-water supply systemsele
|
3
|
H04K
|
2
|
secret communicationjamming of communication
|
4
|
G06F
|
1
|
electric digital data processing
|
5
|
E04F
|
1
|
finishing work on buildings, e.g. stairs, floors
|
6
|
H04L
|
1
|
transmission of digital information, e.g. telegraphic communication
|