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} |
668 | DF | .~.~.~ Rectangular nonmetallic conduit {1} |
669 | .~.~.~.~ Having internal partition |