| 2823272 | Switch mechanism | 1958-02-11 | ||
| 2799754 | Regulating device for electrical switching equipment | 1957-07-16 | ||
| 2739208 | Electric switch | 1956-03-20 | ||
| 2647964 | Switching apparatus | 1953-08-04 | ||
| 2646474 | Universal interlock | 1953-07-21 | ||
| 1864056 | Calculating device | 1932-06-21 | ||
| 1701399 | N/A | 1929-02-05 | ||
| 1349818 | Electrical regulating-switch | 1920-08-17 | ||
| 0619900 | N/A | 1899-02-21 |