| 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 |