| All Patents in class 451/116 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 223,507 | Jan. 13, 1880 | J.L. Hayden | Machinery for Grinding Cocks | valve cock grinders |
| 237,784 | Feb. 15, 1881 | E.V. Tanner | Machine for Grinding Plug Valves | valve grinding tools |
| 370,160 | Sep. 20, 1887 | R.A. Regester | Cock Grinding Machine | grinding machines |
| 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 |
| 950,565 | Mar. 01, 1910 | F.W. Cooke | Machine for Grinding Valve Gage Seats | grinding machines |
