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| Patents for Boynton & Plummer | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 135,613 | Feb. 04, 1873 | E.J. Worcester | Improvement in drilling-machines | |
 | 209,646 | Nov. 05, 1878 | E.N. Boynton, T.F. Carver, G.M. Coburn | Improvement in metal-drilling machines | |
 | 274,026 | Mar. 13, 1883 | O. Plummer | Post for drilling machines | |
 | 480,907 | Aug. 16, 1892 | J. Kindred | Drilling-machine | |
 | 520,142 | May 22, 1894 | A. Goddard | Drilling-machine | |