| All Patents in class 81/475 |
Patents 1 -
10
of 13
      |
| Picture | Number | Date | Patentee | Title |
| | 1,684,231 | Sep. 11, 1928 | A. Levedahl | Stud driver |
| | 1,732,038 | Oct. 15, 1929 | F. Schneider, E.L. Connell | Stud-setting machine |
| | 1,827,269 | Oct. 13, 1931 | G.E. Smith | Tool driving apparatus |
| | 1,855,456 | Apr. 26, 1932 | D.B. Miller | Power driven screw gun with clutch |
| | 1,858,276 | May 17, 1932 | D.B. Miller | Power driven screw gun with clutch |
| | 2,293,786 | Aug. 25, 1942 | E.C. Worden | Wrench |
| | 2,293,787 | Aug. 25, 1942 | E.C. Worden | Torque Wrench |
 | 2,394,348 | Feb. 05, 1946 | G.C. Wilhide | Electric screw driver and nut runner |
| | 2,409,545 | Oct. 15, 1946 | A.L. Cornwell | Torque Wrench |
 | 2,727,598 | Dec. 20, 1955 | W.G. Mitchell, F.A. Kaman | Impact wrench torque control |
