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| All Patents in class 277/502 | |||||
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| Number | Date | Patentee | Title | Type | |
| 933,698 | Sep. 07, 1909 | G.L. Crook | Valve | internal combustion engine valves | |
| 1,229,459 | Jun. 12, 1917 | C.B. Jahnke, F.G. Hobart | Suction-valve holder | internal combustion engine valves | |