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| Patents for John E. Hoy | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,276,366 | Aug. 20, 1918 | R.P. Place, J.E. Hoy | Grinding Wheel Dresser | grinder dressers | |
| 1,287,024 | Dec. 10, 1918 | R.P. Place, J.E. Hoy | Grinding Wheel Dresser | grinder dressers | |