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| Patents for J. H. Chadwick | |||||
| Number | Date | Patentee | Title | Type | |
| 79,548 | Jul. 07, 1868 | S.E. Chubbuck | Improved machine for making tin-lined lead pipe | pipe making machines | |
| 79,549 | Jul. 07, 1868 | J.H. Chadwick, S.E. Chubbuck | Improved machine for making tin-lined lead pipe | pipe making machines | |