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Patents for United States Twist Drill Co. | |||||
Number | Date | Patentee | Title | Type | |
432,635 | Jul. 22, 1890 | S. Moore | Machine for Making Twist Drills | making drills and augers | |
432,636 | Jul. 22, 1890 | S. Moore | Machine for Straightening and Sizing Twist Drills | making drills and augers |