Top IPC subclasses
1
|
F23G
|
3
|
Cremation furnaces; consuming waste or low grade fuels by combustion
|
2
|
F24H
|
3
|
fluid heaters, e.g. water or air heaters, having heat-generating means, in general
|
3
|
F23H
|
2
|
gratescleaning or raking grates
|
4
|
F23B
|
1
|
methods or apparatus for combustion using only solid fuel
|