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| Patents for Frank Armstrong | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-188,601,870 | Feb. 09, 1886 | N.W. Vandegrift, F. Armstrong | Wrenches | quick adjust wrenches | |
| 383,165 | May 22, 1888 | N.W. Vandegrift, F. Armstrong | Bench Vise | bench vises | |
| 392,300 | Nov. 06, 1888 | F. Armstrong, N.W. Vandegrift | Wrench | pipe wrenches | |