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| Patents for H. C. Schroeder | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 959,653 | May 31, 1910 | E.E. Townsend | Valve-seat grinder | |
 | 996,435 | Jun. 27, 1911 | E.E. Townsend | Valve-grinder | |