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| Patents for Ellsworth Ford | |||||
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| Number | Date | Patentee | Title | Type | |
| 131,946 | Oct. 08, 1872 | E. Ford | Improvement in expansive bits | adjustable drill bits | |
| 461,897 | Oct. 27, 1891 | E. Ford | Single-Twist Auger Bit | auger bits | |
| 525,386 | Sep. 04, 1894 | E. Ford | Expansible bit | adjustable drill bits | |