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| Patents for J. W. Walker | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,056,332 | Mar. 18, 1913 | J. Hartness, G.A. Perry | Turret-lathe | |
 | 1,084,546 | Jan. 13, 1914 | J. Hartness | Chuck | |
 | 1,130,274 | Mar. 02, 1915 | J. Hartness | Metal-turning tool | |
 | 1,130,275 | Mar. 02, 1915 | J. Hartness | Metal-turning tool | |
 | 1,130,276 | Mar. 02, 1915 | J. Hartness | Automatic chucking-lathe | |
 | 1,130,277 | Mar. 02, 1915 | J. Hartness | Multispindle lathe | |