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| Patents for Frederick Schrader | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 582,238 | May 11, 1897 | F. Schrader | Adjustable Spanner-Wrench | |
 | 644,033 | Feb. 20, 1900 | F. Schrader | Combined Spanner and Sliding-Jaw Wrench | |