| 2423021 | Resistor ballast | 1947-06-24 | ||
| 2386634 | Flexible electrical insulating layer | 1945-10-09 | ||
| 2375369 | Transparent closure | 1945-05-08 | ||
| 2369803 | Drying device | 1945-02-20 | ||
| 2368771 | Encased electric heating unit and method of making same | 1945-02-06 | ||
| 2360264 | Encased resistor unit | 1944-10-10 | ||
| 2360263 | Encased resistor unit | 1944-10-10 | ||
| 1858483 | Resistance unit | 1932-05-17 | ||
| 1473107 | Resistor | 1923-11-06 | ||
| 1433691 | Heat cartridge | 1922-10-31 | ||
| 1120966 | N/A | 1914-12-15 | ||
| 1032267 | N/A | 1912-07-09 |
| CH56230A | 1912-10-16 |