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| Patents for Reinhold Hakewessel | |||||
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| Number | Date | Patentee | Title | Type | |
| 424,977 | Apr. 08, 1890 | F.K. Rand, R. Hakewessel | Bevel Protractor | protractors | |
| 463,659 | Nov. 24, 1891 | E.E. Claussen | Drilling-machine | drill presses | |