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| Patents for Marcus B. May | |||||
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| Number | Date | Patentee | Title | Type | |
| 710,615 | Oct. 07, 1902 | A.R. Robertson | Magnetic Tack-Hammer | tack hammers | |
| 1,044,553 | Nov. 19, 1912 | H.C. Marx | Marxophone | musical instruments | |