| 2778866 | N/A | |||
| 2768277 | N/A | |||
| 2756166 | Vacuum metallizing and apparatus therefor | |||
| 2404060 | High temperature furnace | |||
| 2394479 | Resistor device | |||
| 2355343 | Furnace for the electrothermal production of magnesium | |||
| 2265821 | Precision resistor | |||
| 1981015 | Apparatus for producing diphenyl | |||
| 1858062 | Electric furnace | |||
| 1700942 | N/A | |||
| 1620940 | N/A | |||
| 1513890 | Electric furnace of the resistor type | |||
| 1338624 | Process of making prepared roofing | |||
| 1279146 | N/A |