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| Patents for Armstrong Brothers Tool Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 535,440 | Mar. 12, 1895 | J. Armstrong | Tool Holder | |
 | 636,741 | Nov. 14, 1899 | J. Armstrong | Tool-holder | |
| 1,214,497 | Feb. 06, 1917 | J. Armstrong | Tool Holder | ||
| 1,242,306 | Oct. 09, 1917 | P. Armstrong | Tool Holder | ||
| 1,584,347 | May 11, 1926 | L.F. Armstrong | Tool Holder | ||