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| Patents for O. S. Walker Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,180,457 | Apr. 25, 1916 | O.S. Walker | Magnetic Chuck | magnetic chucks | |
| 1,180,680 | Apr. 25, 1916 | O.S. Walker | Apparatus for Controlling Magnetic Chucks | magnetic chucks | |
| 1,222,052 | Apr. 10, 1917 | O.S. Walker | magnetic chuck | magnetic chucks | |