| All Patents in class 474/29 |
Patents 1 -
10
of 10
      |
| Picture | Number | Date | Patentee | Title |
| | 692,120 | Jan. 28, 1902 | G.F. Conner | Reversible Variable Speed Gearing |
| | 1,950,675 | Mar. 13, 1934 | D.H. Heynau | Friction gear for stepless changing the rotation of a driven shaft |
 | 2,094,750 | Oct. 05, 1937 | P.B. Reeves, H.E. Brooks | Speed varying power drive |
 | 2,133,593 | Oct. 18, 1938 | H.E. Tautz | Variable speed drive |
| | 2,170,502 | Aug. 22, 1939 | M.E. Martellotti | Machine Tool Transmission |
| | 2,199,491 | May 07, 1940 | D.H. Heynau | Friction gear transmission |
| | 2,248,948 | Jul. 15, 1941 | H.A. Bowers | Variable Speed Transmission |
 | 2,604,794 | Jul. 29, 1952 | F.B. Scott | Belt Tensioning Device for Variable Speed Drives |
| | 3,066,545 | Dec. 04, 1962 | F.D. Gaylord | Variable Speed Drive |
 | 3,146,628 | Sep. 01, 1964 | J.H. Diehl, E.C. Warrick, D.D. Pettigrew | Power tool and transmission therefor |
