| Patents for Paul Armstrong |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 675,184 | May 28, 1901 | J. Armstrong | Tool Holder | metal planer tool holders |
| 745,758 | Dec. 01, 1903 | S. Welter, J. Armstrong | Slotting Machine Tool Holder | slotting machine tool holders |
| 779,516 | Jan. 10, 1905 | J. Armstrong | Process of Cuttting Self Hardening Steel | |
| 914,012 | Mar. 02, 1909 | P. Armstrong | Ratchet Drill | drill accessories |
| 1,242,306 | Oct. 09, 1917 | P. Armstrong | Tool Holder | metal shaper tool holders |
| 1,676,210 | Jul. 03, 1928 | P. Armstrong | Pipe Wrench | pipe wrenches |
