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| Patents for Grant Anti-Friction Ball Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 365,407 | Jun. 28, 1887 | H. Richardson | Machinery for grinding spherical balls | |
 | 517,004 | Mar. 20, 1894 | R.H. Grant | Automatic turning-machine | |
 | 520,019 | May 15, 1894 | R.H. Grant | Grinding-machine | |