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| Patents for Harry S. Spencer | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 642,178 | Jan. 30, 1900 | J.R. Thomas, H.S. Spencer | Clamping device | |
 | 642,645 | Feb. 06, 1900 | J.R. Thomas, H.S. Spencer | Boring-machine | |
 | 749,458 | Jan. 12, 1904 | H.S. Spencer | Dovetailing-machine | |
 | 752,313 | Feb. 16, 1904 | J.R. Thomas, H.S. Spencer | Feeding device for woodworking-machines | |
 | 756,725 | Apr. 05, 1904 | H.S. Spencer | Hollow-chisel mortising-machine | |
 | 767,504 | Aug. 16, 1904 | H.S. Spencer | Mortising-machine | |