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Patents for John Olsen
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
895,056	Aug. 04, 1908	C.G. Sprado	Valve and Valve Gearing	internal combustion engine valves
923,594	Jun. 01, 1909	C.G. Sprado	Gas Engine	internal combustion engine valves

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