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| All Patents in class 72/69 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 97,691 | Dec. 07, 1869 | T.T. Prosser | Improved machine for swaging threads on screws | |
| 438,406 | Oct. 14, 1890 | M.W. Dewey | Method of Utilizing Electricity in the Forming of Sheet Metal Articles | ||