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| Patents for Andrew J. Hamilton | |||||
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| Number | Date | Patentee | Title | Type | |
| 624,875 | May 09, 1899 | W.D. Arnott, B.E. Sawyer | replaceable screwdriver blade | screwdriver blades | |
| 624,876 | May 09, 1899 | B.E. Sawyer | Surface Gage | surface gauges | |
| 642,170 | Jan. 30, 1900 | L.S. Starrett | Split Nut | calipers | |
| 672,634 | Apr. 23, 1901 | S.H. Bellows | Surface Gage | surface gauges | |
| 783,721 | Feb. 28, 1905 | E.C. Clapp | Micrometer Gage | micrometers | |