126 / | HD | STOVES AND FURNACES |
569 | DF | SOLAR HEAT COLLECTOR {18} |
684 | .~ With concentrating reflector {5} | |
685 | DF | .~.~> Plural reflectors in optical series {2} |
688 | DF | .~.~> Spot focus {3} |
692 | DF | .~.~> Line focus {3} |
696 | DF | .~.~> Reflector support |
697 | DF | .~.~> Inflatable reflector |