| All Patents in class 474/37 |
Patents 1 -
10
of 10
      |
| Picture | Number | Date | Patentee | Title |
 | 1,842,194 | Jan. 19, 1932 | V.H. Peterson | Variable speed mechanism for drills |
| | 2,032,015 | Feb. 25, 1936 | D.H. Heynau | Friction gear transmission |
| | 2,199,491 | May 07, 1940 | D.H. Heynau | Friction gear transmission |
| | 2,475,954 | Jul. 12, 1949 | W.E. Gerbing | Variable speed pulley |
| | 2,475,955 | Jul. 12, 1949 | W.E. Gerbing | Variable pitch pulley |
| | 2,893,253 | Jul. 07, 1959 | P.K. Beemer | Variable pitch pulley mechanism |
 | 2,927,612 | Mar. 08, 1960 | J.W. Edgemond, Jr., H. Goldschmidt | Combination wood-working machine |
 | 3,009,294 | Nov. 21, 1961 | T.J. Lindem, J. van Roojen | Grinder with wheel dresser |
| | 3,049,932 | Aug. 21, 1962 | S.C. Straus | Variable Pitch Driving System |
| | 3,154,959 | Nov. 03, 1964 | B.N. Palm | Variable speed drive |
