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| Patents for E. F. Allen & Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 425,186 | Apr. 08, 1890 | G.J. Ridley | Grinding-machine | sharpening machines | |
| 618,293 | Jan. 24, 1899 | G.J. Ridley | Water-feeding device for grinding-wheels | tool grinders | |