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| Patents for Cogsdill Twist Drill Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,242,510 | May 20, 1941 | S.A. Cogsdill | Adjustable countersink structure | metalworking countersinks | |
| 2,308,055 | Jan. 12, 1943 | S.A. Cogsdill | Adjustable countersink structure | metalworking countersinks | |