| 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} | 
| 670 | DF | .~.~.~ Circular metallic conduit {1} | 
| 671 |  | .~.~.~.~ Having internal partition |