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| Patents for Charles J. Graf | |||||
| Number | Date | Patentee | Title | Type | |
| 591,561 | Oct. 12, 1897 | H.A. Moyer, C.J. Graf | Thill-coupling | ||
| 610,768 | Sep. 13, 1898 | H.A. Moyer, C.J. Graf | Thill-coupling | ||