| All Patents in class 74/358 |
Patents 1 -
8
of 8
      |
| Picture | Number | Date | Patentee | Title |
 | 426,588 | Apr. 29, 1890 | S.E. Hildreth | Upright drill |
| | 624,017 | May 02, 1899 | F.G. Hampson | Change Driving Gear |
 | 744,678 | Nov. 17, 1903 | N.D. Chard | Variable-Speed Mechanism |
| | 804,999 | Nov. 21, 1905 | W.E. Blair | Variable-Speed Gearing |
| | 816,128 | Mar. 27, 1906 | W.L. Schellenbach | Variable Speed Driving Mechanism |
| | 1,678,384 | Jul. 24, 1928 | B.P. Graves | Variable Speed Driving Mechanism |
| | 1,688,534 | Oct. 23, 1928 | S. Einstein | Vaiable Speed Spindle Drive |
| | 1,825,719 | Oct. 06, 1931 | S. Einstein | Control Mechanism |
