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| All Patents in class 451/138 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 222,736 | Dec. 16, 1879 | G. Richards | Machines for Grinding the Sector of Circles | ||
| 508,268 | Nov. 07, 1893 | J.S. Bancroft | Machine for Sharpening Drills | ||
| 529,013 | Nov. 13, 1894 | B.F. Barnes | Milling Machine | ||
 | 630,325 | Aug. 08, 1899 | H.W. Cheney | Bevel-gear-generating machine | |
 | 646,397 | Mar. 27, 1900 | W.H. Thorne, J.S. Bancroft | Grinding-Machine | |
 | 704,348 | Jul. 08, 1902 | J.N. Lapointe | Grinding-machine | |
| 774,030 | Nov. 01, 1904 | L.B. Benton | Grinding Machine | ||