|
F24V 30/00
|
Apparatus or devices using heat produced by exothermal chemical reactions other than by combustion |
|
F24V 40/00
|
Production or use of heat resulting from internal friction of moving fluids or from friction between fluids and moving bodies |
|
F24V 40/10
|
Production or use of heat resulting from internal friction of moving fluids or from friction between fluids and moving bodies the fluid passing through restriction means |
|
F24V 50/00
|
Use of heat from natural sources, e.g. from the sea |
|
F24V 99/00
|
Subject matter not provided for in other main groups of this subclass |
