Heating Systems Patents (Class 237)
Miscellaneous (Class 237/1R)
Automatic control (Class 237/2R)
Heat and power plants (Class 237/12.1)
Plants (Class 237/13)
Brooder and incubator (Class 237/14)
Combined radiator and boiler (Class 237/16)
Combined with water heater (Class 237/19)
Vehicle (Class 237/28)
Heated floor (Class 237/69)
Ventilating (Class 237/46)
Air (Class 237/50)
Water (Class 237/56)
Steam (Class 237/67)
Heat radiators (Class 237/70)
Antifreezing devices (Class 237/80)
Processes (Class 237/81)

Foreign Patent Art Collections

Class-related foreign documents (Class 237/FOR000)

Digests

Inert gas (Class 237/DIG1)