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| Patents for John C. Dupee | |||||
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| Number | Date | Patentee | Title | Type | |
| 235,860 | Dec. 28, 1880 | J.C. Dupee, C.P. Housum | Calf Weaner | animal weaners | |
| 257,481 | May 09, 1882 | J.C. Dupee | Calf Weaner | animal weaners | |
| 260,748 | Jul. 11, 1882 | J.C. Dupee | Calf Weaner | animal weaners | |