| All Patents in class 81/452 |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| 47,102 | Apr. 04, 1865 | D.F. Hartford | Screwdriver and Tweezers | clockmaker |
| 79,509 | Jun. 30, 1868 | N. Smith | Screw holding screwdriver | screw starters |
| 845,978 | Mar. 05, 1907 | F.D. Rappelee | Screw-driver attachment | screwdrivers |
| 873,771 | Dec. 17, 1907 | J. McCoy | Bench screwdriver | screwdriver mechanisms |
| 882,937 | Mar. 24, 1908 | T.J. Fegley | Screw-eye driver | screwdriver blades |
| 914,174 | Mar. 02, 1909 | S.G. North | Screw-holder for screw-drivers | screwdrivers |
| 1,635,437 | Jul. 12, 1927 | J. Ryan | Offset Tool Holder | screwdriver mechanisms |
| 4,644,831 | Feb. 24, 1987 | M. Yang | Adaptor Sleeve | tool holders |
