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| Patents for De Hart Bergen | |||||
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| Number | Date | Patentee | Title | Type | |
| 821,984 | May 29, 1906 | V.J. Wahlstrom, B.T. Burchardi | Clutch and counter-shaft mechanism | friction clutches | |
| 884,243 | Apr. 07, 1908 | V.J. Wahlstrom | Milling-machine | milling machines | |