| Patents for Matthew E. Campfield |
Patents 1 -
9
of 9
      |
| Number | Date | Patentee | Title | Type |
| 99,155 | Jan. 25, 1870 | M.E. Campfield | Improvement in mortising-machine | mortising machines |
| 166,587 | Aug. 10, 1875 | M.E. Campfield | Improvements in Screw-Wrenches | wrench handle components |
| 257,468 | May 09, 1882 | M.E. Campfield | Wrench | screw adjust wrenches |
| 285,796 | Oct. 02, 1883 | M.E. Campfield | Improvements in Blanks for Forging the Hammer-Jaws of Monkey Wrenches | wrench jaw components |
| 303,385 | Aug. 12, 1884 | M.E. Campfield | Making Screws For Monkey Wrenches | wrench components |
| 354,770 | Dec. 21, 1886 | M.E. Campfield | Wrench | quick adjust wrenches |
| 371,302 | Oct. 11, 1887 | M.E. Campfield | Rapid Transit Monkey Wrench | quick adjust wrenches |
| 380,859 | Apr. 10, 1888 | M.E. Campfield | Combined Nut and Pipe Wrench | quick adjust wrenches |
| 395,213 | Dec. 25, 1888 | M.E. Campfield | Machine For Truing and Dressing Wrench Blanks | |
