Number | Name | Date | Kind |
---|---|---|---|
1918392 | Hohnhorst | Jul 1933 | |
2092591 | Sohlstrom | Sep 1937 | |
2173461 | Wagner | Sep 1939 | |
2173462 | Wagner | Sep 1939 | |
2351561 | Thompson | Jun 1944 | |
2693670 | Perry | Nov 1954 | |
2809478 | Lewis | Oct 1957 | |
2958165 | Hofmann | Nov 1960 | |
3367068 | Dooley | Feb 1968 | |
3636665 | Shaw | Jan 1972 | |
3780476 | Sipe | Dec 1973 |
Number | Date | Country |
---|---|---|
67442 | Apr 1892 | DE2 |
2530835 | Jan 1977 | DEX |
393269 | Dec 1908 | FRX |
451781 | Aug 1936 | GBX |
Entry |
---|
Fifth Annual Report, Grinding Wheel Institute, Sweeney et al., Apr. 1969. |