| All Patents in class 476/53 |
Patents 1 -
4
of 4
      |
| Number | Date | Patentee | Title | Type |
| 1,950,675 | Mar. 13, 1934 | D.H. Heynau | Friction gear for stepless changing the rotation of a driven shaft | industrial machine speed and direction changing mechanisms |
| 2,032,015 | Feb. 25, 1936 | D.H. Heynau | Friction gear transmission | industrial machine speed and direction changing mechanisms |
| 2,170,502 | Aug. 22, 1939 | M.E. Martellotti | Machine Tool Transmission | metalworking variable speed mechanisms |
| 2,199,491 | May 07, 1940 | D.H. Heynau | Friction gear transmission | industrial machine speed and direction changing mechanisms |
