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| Patents for Charles A. Mertens | |||||
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| Number | Date | Patentee | Title | Type | |
| 649,498 | May 15, 1900 | E. Walker | Cork-puller | bar corkscrews | |
| 1,041,978 | Oct. 22, 1912 | E.G. Diefendorf | Pipe Wrench | pipe wrenches | |