| 126 / | HD | STOVES AND FURNACES |
| 569 | DF | SOLAR HEAT COLLECTOR {18} |
| 628 | DF | .~ Including means to utilize fluent medium from collector to heat interior of building {2} |
| 629 | DF | .~.~ With device to circulate air from room of building through collector {3} |
| 630 | | .~.~.~ Plural circulators |