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| Patents for Robert H. Hazeltine | |||||
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| Number | Date | Patentee | Title | Type | |
| 918,049 | Apr. 13, 1909 | R.H. Hazeltine | Machine for Reseating Valves | valve grinding tools | |
| 918,050 | Apr. 13, 1909 | R.H. Hazeltine | Valve Grinding Device | valve grinding tools | |
| RE13,421 | May 21, 1912 | R.H. Hazeltine | Machine for Reseating Valves | valve grinding tools | |