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| Patents for Graham Twist Drill Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 339,544 | Apr. 06, 1886 | S.P. Graham | Combined boring-tool and holder | metalworking twist drills | |
| CA-24,874 | Sep. 03, 1886 | S.P. Graham | Combined drill and bit shank and holder | metalworking twist drills | |