| Number | Date | Country | Kind |
|---|---|---|---|
| PD5647 | Aug 1978 | AUX |
| Number | Name | Date | Kind |
|---|---|---|---|
| 1531070 | Bruns | Mar 1925 | |
| 2091144 | Friel | Aug 1937 | |
| 2180181 | Versoy | Nov 1939 | |
| 2402949 | Carmichael | Jul 1946 | |
| 3068744 | O'Hara-Wright | Dec 1962 | |
| 3090157 | Lohr | May 1963 | |
| 3726026 | Bercherding | Apr 1973 |
| Number | Date | Country |
|---|---|---|
| 569665 | Feb 1933 | DE2 |
| 1279945 | Nov 1961 | FRX |
| 846963 | Sep 1960 | GBX |
| Entry |
|---|
| Gardner, A. R.-Article in Product Engineering of Jan. 9, 1961, pp. 65-68. |