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