| 2863311 | Gyration and rotation mechanism for domestic appliance | 1958-12-09 | ||
| 2802356 | Acceleration control device for centrifugal extractors | 1957-08-13 | ||
| 2650872 | Method and apparatus utilizing compressional wave energy in the upper sonic and supersonic range for washing textiles | 1953-09-01 | ||
| 2468550 | Method of and apparatus for cleaning by ultrasonic waves | 1949-04-26 | ||
| 1242824 | N/A | 1917-10-09 |
| DE556791C | 1932-08-13 | |||
| FR1211577A | 1960-03-17 |