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| Patents for Hewitt A. Gehres | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,687,609 | Oct. 16, 1928 | H.A. Gehres | Driving Mechanism for Engine Accesories | attachments | |
| 1,890,051 | Dec. 06, 1932 | H.A. Gehres | Valve Mechanism | internal combustion engine valves | |