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| Patents for William Guthardt | |||||
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| Number | Date | Patentee | Title | Type | |
| 225,355 | Mar. 09, 1880 | W.H. Doane, G.W. Bugbee | Spoke-throating machines | wheelwright | |
| 227,223 | May 04, 1880 | W.H. Doane, G.W. Passel, G.W. Bugbee | Variety wood-worker | jointers | |
| 232,365 | Sep. 21, 1880 | G.W. Passell | Friezing-machine | wood shapers | |