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| Patents for O. S. Walker & Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 411,845 | Oct. 01, 1889 | O.S. Walker | Drill-grinding machine | |
 | 425,839 | Apr. 15, 1890 | O.S. Walker | Twist-drill-grinding machine | |
 | 564,296 | Jul. 21, 1896 | O.S. Walker | Magnetic chuck | |
 | 607,306 | Jul. 12, 1898 | O.S. Walker | Twist-drill-grinding machine | |
 | 614,190 | Nov. 15, 1898 | O.S. Walker | Magnetic chuck | |
 | 643,927 | Feb. 20, 1900 | O.S. Walker | Drill-grinder | |