| Patents for F25B 29 - Combined heating and refrigeration systems, e.g. operating alternately or simultaneously (6,502) | |
|---|---|
| 02/1976 | |
| 02/17/1976 | US3938352 Water to air heat pump employing an energy and condensate conservation system |
| 02/03/1976 | US3935899 Integrated thermal energy control system using a heat pump |