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| Patents for Harry Opsahl | |||||
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| Number | Date | Patentee | Title | Type | |
| 919,370 | Apr. 27, 1909 | N. Lund | Combination Tack Hammer and Puller | tack hammers | |
| 1,075,889 | Oct. 14, 1913 | E.J. Woolf | Two-Cycle Explosive Engine | internal combustion engines | |