US Patent Class 237
HEATING SYSTEMS-- Main Headings
 Electronic File Wrappers |  Electronic Patent Documents |  Paper Patent Documents | Current as of: June, 1999
|  and Services |
| Electronic File Wrappers | Electronic Patent Documents | Paper Patent Documents | Current as of: June, 1999
| and Services |
| CLASS NOTES | ||
| 1 R | DF | MISCELLANEOUS {1} |
| 2 R | DF | AUTOMATIC CONTROL {9} |
| 12.1 | DF | HEAT AND POWER PLANTS {3} |
| 13 | DF | PLANTS |
| 14 | DF | BROODER AND INCUBATOR {1} |
| 16 | DF | COMBINED RADIATOR AND BOILER {2} |
| 19 | DF | COMBINED WITH WATER HEATER |
| 28 | DF | VEHICLE {7} |
| 69 | DF | HEATED FLOOR |
| 46 | DF | VENTILATING {3} |
| 50 | DF | AIR {4} |
| 56 | DF | WATER {5} |
| 67 | DF | STEAM {1} |
| 70 | DF | HEAT RADIATORS {6} |
| 80 | DF | ANTIFREEZING DEVICES |
| 81 | DF | PROCESSES |
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| DIGEST | ||
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| DIG 1 | DF | Inert gas |