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| Patents for May Frères & Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 312,140 | Feb. 10, 1885 | E. May | Machine for Turning Pearl Buttons | button making machinery | |
| 314,596 | Mar. 31, 1885 | E. May | Machine for the Manufacturing of Pearl Buttons | button making machinery | |