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| Patents for John P. Hill | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,778,924 | Jan. 22, 1957 | J.P. Hill | Apparatus and method for producing flat surfaces | milling machine cutters | |
| 2,797,299 | Jun. 25, 1957 | J.P. Hill | Method of forming serrations at the back of the blade of cutting elements | milling machine cutters | |