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| All Patents in class 470/71 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 596,750 | Jan. 04, 1898 | J. Hartness | Screw Cutting Attachment | ||
| 619,139 | Feb. 07, 1899 | C.F. Chase | Screw Cutting Apparatus | ||
| 1,470,683 | Oct. 16, 1923 | R.A. Boehm | Screw Cutting Machine | ||