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| All Patents in class 137/627 | |||||
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| Number | Date | Patentee | Title | Type | |
| 497,239 | May 09, 1893 | W.W. Grant | Gas Engine | gas and gasoline engines | |
| 2,461,328 | Feb. 08, 1949 | W.S. Landon | Controlling Means and System | flow controls | |