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| Patents for John Sprogell | |||||
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| Number | Date | Patentee | Title | Type | |
| 301,119 | Jul. 01, 1884 | J. Sprogell, H.S. Haskins | Overhead railway | hoists, winches, come-alongs | |
| 301,177 | Jul. 01, 1884 | H.S. Haskins, J. Sprogell | Overhead railway | hoists, winches, come-alongs | |