| Patents for B23F 17 - Special methods or machines for making gear teeth, not covered by groups (404) | |
|---|---|
| 12/1980 | |
| 12/16/1980 | US4238970 Bevolute gear system |
| 09/1980 | |
| 09/30/1980 | US4224834 Mating spur gears |
| 07/1980 | |
| 07/08/1980 | US4211511 Method of manufacturing pairs of spur gears |
| 01/1980 | |
| 01/15/1980 | US4183703 Apparatus for manufacturing pairs of spur gears |