| 2085198 | Microphonic switch | 1937-06-29 | ||
| 2075774 | Vibration actuated controller | 1937-03-30 | ||
| 1619010 | Contact device and insulation | 1927-03-01 | ||
| 1141158 | N/A | 1915-06-01 | ||
| 1108750 | N/A | 1914-08-25 | ||
| 1078595 | N/A | 1913-11-11 | ||
| 0866377 | N/A | 1907-09-17 | ||
| 0817009 | N/A | 1906-04-03 | ||
| 0466644 | N/A | 1892-01-05 |