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| Patents for H. S. Spencer | |||||
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| Number | Date | Patentee | Title | Type | |
| 532,035 | Jan. 08, 1895 | W.H. Doane, J. Sofge | Mortising-machine | mortising machines | |
| 650,820 | Jun. 05, 1900 | F. Danner, G.W. Bugbee | Double-end tenoner | tenoning machines | |