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| Patents for John Olsen | |||||
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| 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 | |