| All Patents in class 474/28 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 1,035,860 | Aug. 20, 1912 | C.M. Conradson | Speed Variator | metalworking machine mechanisms |
| 1,545,638 | Jul. 14, 1925 | H.C. Clay | Automatic Speed Regulation | industrial machine speed and direction changing mechanisms |
| 2,112,141 | Mar. 22, 1938 | H.C. Clay | Hydraulic Control for Variable Speed Transmissions | industrial machine speed and direction changing mechanisms |
| 2,256,114 | Sep. 16, 1941 | D. Heyer | Variable speed drive with multiple belts | industrial machine pulleys and belt drive mechanisms |
| 2,295,161 | Sep. 08, 1942 | H.C. Clay | Hydraulic Control Mechanism | hydraulic machinery |
| 2,306,541 | Dec. 29, 1942 | H.C. Clay | Floating Hydraulic Control | hydraulic machinery |
| 2,714,313 | Aug. 02, 1955 | W.E. Gerbing | Variable pitch pulley | industrial machine pulleys and belt drive mechanisms |
