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| Patents for Charles A. Widmer | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,424,538 | Aug. 01, 1922 | C.A. Widmer | Drill press | drill presses | |
| 2,050,594 | Aug. 11, 1936 | C.A. Widmer | Tool Holder and Post | lathe tool holders and tool posts | |