1904
https://www.google.com/patents/US750684 - Ransom E. Olds Valve Gear for Explosive Engines
1899
https://www.google.com/patents/US635506 - Ransom E. Olds - Electric Igniter for Gas Engines
1896
https://www.google.com/patents/US570263 Ransom E. Olds - Comined Gas and Steam Engine
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