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| Patents for Thomas H. Coffey | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,575,332 | Nov. 20, 1951 | H.D. Cummins | Drill | drill bits | |
| 2,693,725 | Nov. 09, 1954 | H.D. Cummins | Method of Making Cutting Tools | ||