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| Patents for A. H. Opsahl | |||||
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| Number | Date | Patentee | Title | Type | |
| 750,449 | Jan. 26, 1904 | W.J. Gillard | Depth Gage | micrometer depth gauges | |
| 849,891 | Apr. 09, 1907 | E. Ellingson | Combination Wrench | alligator wrenches | |
| 919,370 | Apr. 27, 1909 | N. Lund | Combination Tack Hammer and Puller | tack hammers | |
| 1,128,135 | Feb. 09, 1915 | G.H. Hammond | Valve Pick-Up Tool | ||