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| Patents for R. P. Spencer | |||||
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| Number | Date | Patentee | Title | Type | |
| 139,006 | May 20, 1873 | S.W. Hemenway | Improvement in Auger Handles | ||
| 302,331 | Jul. 22, 1884 | C.L. Griswold | Corkscrew | self and partial cork pullers | |