| All Patents in class 81/441 |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| 216,023 | Jun. 03, 1879 | R.T. Crane | Improvement in Boring and Reaming Tools | tapered reamers |
| 267,709 | Nov. 21, 1882 | P. Nadig | Screw Driver | screwdriver blades |
| 291,193 | Jan. 01, 1884 | S.H. Jenkins | Bung Bush Wrench | wrenches |
| 1,105,535 | Jul. 28, 1914 | J.O. Roberts | Screw Extractor | screw extractors |
| 1,738,405 | Dec. 03, 1929 | B. Thal | Improvement in Screwdriver blades | screwdriver blades |
| 1,741,349 | Dec. 31, 1929 | R.R. Sullivan | Improvement in Screwdriver blades | screwdriver blades |
| 1,782,981 | Nov. 25, 1930 | J.A. Anderson | Improvement in Screwdriver blades | screwdriver blades |
| 1,875,484 | Sep. 06, 1932 | F. Nigra | Screw Extractor | screw extractors |
