| All Patents in class 81/97 |
Patents 1 -
10
of 95
      |
| Picture | Number | Date | Patentee | Title |
 | 6,002 | Jan. 02, 1849 | F.H. Bartholomew, S. Merrick | Screw Wrench For Grasping Cylindrical Forms |
 | 12,510 | Mar. 13, 1855 | J. Hyde | Improvement in Screw-Wrenches |
 | 14,424 | Mar. 11, 1856 | E. Tracy | Wrench |
 | 15,184 | Jun. 24, 1856 | G.A. Jenks | Wrench for Gas-Pipe, etc. |
 | 24,175 | May 24, 1859 | H.J. Behrens | Improved Gripping Wrench |
 | 26,951 | Jan. 24, 1860 | J.E. Neill | Improved Gripping Wrench |
 | 28,053 | May 01, 1860 | W.F. Beecher | Pipe-Wrench |
 | 30,579 | Nov. 06, 1860 | W. Kearney | Improvements in Wrenches for Pipes and Stud-Bolts |
 | 32,453 | May 28, 1861 | G.B. Phillips | Pipe Wrench |
 | 35,950 | Jul. 22, 1862 | H.F. Read | Improved Pipe-Wrench for Screwing and Unscrewing Metal Pipes |
