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