| 126 / | HD | STOVES AND FURNACES |
| 569 | DF | SOLAR HEAT COLLECTOR {18} |
| 634 | DF | .~ With means to convey fluent medium through collector {7} |
| 651 | DF | .~.~ Conduit absorber structure {9} |
| 663 | ![]() | .~.~.~ Plural conduits {2} |
| 664 | DF | .~.~.~.~> Noncircular conduit |
| 665 | DF | .~.~.~.~> Flexible conduit |