Number | Name | Date | Kind |
---|---|---|---|
1817220 | Young | Aug 1931 | |
1962127 | Balkema et al. | Jun 1934 | |
2252534 | Trotter | Aug 1941 | |
2985317 | Bannister | May 1961 | |
3690482 | Gaumont | Sep 1972 | |
4068876 | Muellner | Jan 1978 | |
4264262 | LoCodo | Apr 1981 |
Number | Date | Country |
---|---|---|
1142688 | Jan 1963 | DEX |
2608523 | Sep 1977 | DEX |
Entry |
---|
American Towman, vol. 3, No. 1, Jul./Aug. 1979, EKA Recovery Systems Advertisement. |