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| Patents for H. M. Plaisted | |||||
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| Number | Date | Patentee | Title | Type | |
| 451,283 | Apr. 28, 1891 | G.L. Webb | Wrench | screw adjust wrenches | |
| 494,134 | Mar. 28, 1893 | C.F. Endter, J. Foos | Gas Engine | gas and gasoline engines | |
| 1,282,156 | Oct. 22, 1918 | M.F. Williams | Lip Plate for Grinders | ||