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| All Patents of Type: valve cock grinders | |||||
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| Number | Date | Patentee | Title | Type | |
| 223,507 | Jan. 13, 1880 | J.L. Hayden | Machinery for Grinding Cocks | valve cock grinders | |
| 430,142 | Jun. 17, 1890 | G.B. Chadwick | Machine for Grinding Cocks Automatically | valve cock grinders | |
| 480,258 | Aug. 09, 1892 | P. Gerstenkorn | Machine for Grinding Cocks | valve cock grinders | |
| 521,980 | Jun. 26, 1894 | C.M. Jarvis | Machine for Grinding Cocks Automatically | valve cock grinders | |