| All Patents in class 81/453 |
Patents 16 -
28
of 28
      |
| Number | Date | Patentee | Title | Type |
| 1,212,743 | Jan. 16, 1917 | J.W. Cowell | Screw Holding Device | screwdriver blades |
| 1,250,682 | Dec. 18, 1917 | W.F. Sholl | Combination Screwdriver and Tweezers | screwdrivers |
| 1,412,550 | Apr. 11, 1922 | B.L. Bentley | Screw Gripping Screwdriver | screwdriver blades |
| 1,433,341 | Oct. 24, 1922 | C.W. Cole | Screw Holder for screw drivers | screwdrivers |
| 1,522,927 | Jan. 13, 1925 | J.F. Davis, M. Paul, F.J. Wickstrom | Screw Gripping Screwdriver | screwdriver blades |
| 1,562,543 | Nov. 24, 1925 | S.J. Cox | Screw Gripping Screwdriver | screwdriver blades |
| 1,687,788 | Oct. 16, 1928 | A.S. Pinkus | Screw Gripping Screwdriver | screwdriver blades |
| 1,791,771 | Feb. 10, 1931 | R.J. Velepec | Screw Driver | screwdrivers |
| 1,889,330 | Nov. 29, 1932 | G.L. Robinson, H.C. Humes | Screw Gripping Screwdriver | screwdriver blades |
| 1,925,385 | Sep. 05, 1933 | H.C. Humes, G.L. Robinson | Screw Gripping Screwdriver | screwdriver blades |
| 2,185,910 | Jan. 02, 1940 | S.J. Cox | Screw Gripping Screwdriver | screwdriver blades |
| 2,206,364 | Jul. 02, 1940 | J.N. Petre | Screw Driver Attachment | screwdriver mechanisms |
| 2,292,657 | Aug. 11, 1942 | D.E. Priest | Screw Holder | |
