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| All Patents in class 29/DIG.055 | |||||
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| Number | Date | Patentee | Title | Type | |
| 142,511 | Sep. 02, 1873 | S.W. Putnam, Jr. | Improvement in machines for tapping nuts | nut or bolt making machines | |
| 838,556 | Dec. 18, 1906 | H. Lutter, E.A. Gies | Grinding-machine | bench or pedestal grinders | |