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| Patents for Northampton Emery Wheel Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 112,838 | Mar. 21, 1871 | J.L. Otis | Improvement in machines for grinding saw-teeth | |
 | 182,284 | Sep. 19, 1876 | J.L. Otis | Planer-knife grinder | |
 | 344,919 | Jul. 06, 1886 | P.A. Otis | Improved planer-knife grinder | |