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| Patents for Joseph B. Spencer | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 98,116 | Dec. 21, 1869 | J.B. Spencer | Improvement in floor-clamp | |
| 331,839 | Dec. 08, 1885 | J.B. Spencer, C.H. Spencer | Shingle-slicing machine | ||