| Class 237 | HEATING SYSTEMS |
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![[List of Pre Grant Publications for class 237 subclass 1R]](../as.gif) | ![[List of Patents for class 237 subclass 1R]](../ps.gif) | 1R | MISCELLANEOUS |
| | 2R | AUTOMATIC CONTROL |
| | 3 |  Brooder and incubator |
| | 5 | Car |
| | 7 | Combined radiator and boiler |
| | 8R | Water |
| | 8A |  Automatic heating systems (water) with controls |
| | 8B | Heating systems with high temperature boiling liquids |
| | 8C | With boiler by-pass valve control |
| | 8D | Compact heating systems with controls |
| | 9R | Steam |
| | 10 | Gas displaced |
| | 9A | Automotive systems |
| | 9B | With direct contact between products of combustion and the liquid to be vaporized |
| | 11 | Compressed air |
| | 12 | Processes |
| | 2A | Automatic heating systems with controls |
| | 2B | Heat source is a reverse cycle refrigerating system or heat pump |
| | 12.1 | HEAT AND POWER PLANTS |
| | 12.2 | Fire engine |
| | 12.3R | Vehicle |
| | 12.3A | The heating is effected by circulated air |
| | 12.3B | The heating is effected by circulated hot water |
| | 12.3C | The heating system includes a combustion type heater |
| | 12.4 | Car |
| | 13 | PLANTS |
| | 14 | BROODER AND INCUBATOR |
| | 16 | COMBINED RADIATOR AND BOILER |
| | 19 | COMBINED WITH WATER HEATER |
| | 28 | VEHICLE |
| | 69 | HEATED FLOOR |
| | 46 | VENTILATING |
| | 50 | AIR |
| | 56 | WATER |
| | 67 | STEAM |
| | 70 | HEAT RADIATORS |
| | 80 | ANTIFREEZING DEVICES |
| | 81 | PROCESSES |
| FOREIGN ART COLLECTIONS | ||
| FOR000 | CLASS-RELATED FOREIGN DOCUMENTS |
| DIGESTS | ||
| | DIG1 | INERT GAS |