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| All Patents in class 137/601.12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 417,770 | Dec. 24, 1889 | M.H. Collom | Speed Governor | steam pumps | |
| 2,461,328 | Feb. 08, 1949 | W.S. Landon | Controlling Means and System | flow controls | |