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| Patents for Joseph W. Zimmerman | |||||
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| Number | Date | Patentee | Title | Type | |
| 182,340 | Sep. 19, 1876 | J.W. Zimmerman | Improvement in friction feed-clutches for circular-saw mills | sawmill feed works | |
| RE8,339 | Jul. 16, 1878 | J.W. Zimmerman | Improvement in friction feed-clutches for circular-saw mills | sawmill feed works | |