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| Patents for Michael H. Dempsey | |||||
| Picture | Number | Date | Patentee | Title | |
![]() | 779,848 | Jan. 10, 1905 | G. Hart | Grinding-wheel | |
![]() | 825,460 | Jul. 10, 1906 | G. Hart | Grinding-wheel | |
![]() | 945,526 | Jan. 04, 1910 | G. Hart | Grinding-wheel | |