| | ||
| Home| FAQ | Search:Advanced|Person|Company| Type|Class | Login | |
| Quick search: | ||
| Patents for Detroit Twist Drill Co. | |||||
      | |||||
| Number | Date | Patentee | Title | Type | |
| 339,544 | Apr. 06, 1886 | S.P. Graham | Combined boring-tool and holder | metalworking twist drills | |
| 449,246 | Mar. 31, 1891 | S.P. Graham | Boring-tool holder | drill press chucks | |