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Patents for E. F. Allen & Co. | |||||
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Picture | Number | Date | Patentee | Title | |
![]() | 425,186 | Apr. 08, 1890 | G.J. Ridley | Grinding-machine | |
![]() | 618,293 | Jan. 24, 1899 | G.J. Ridley | Water-feeding device for grinding-wheels |