| Patents for Plumb, Burdict & Barnard |
Patents 1 -
4
of 4
      |
| Number | Date | Patentee | Title | Type |
| GB-186,601,089 | Apr. 30, 1866 | O.C. Burdict | Improvements in manufacturing nuts and the preparation of the metal therefor, and in the machinery or apparatus employed therein | nut or bolt making machines |
| 68,555 | Sep. 03, 1867 | O.C. Burdict | Improved machine for heading bolts | nut or bolt making machines |
| 97,351 | Nov. 30, 1869 | O.C. Burdict | Improved bolt-heading machine | nut or bolt making machines |
| 330,901 | Nov. 24, 1885 | H.J. Johnson | Machine for forging bolt-blanks | nut or bolt making machines |
