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| All Patents in class 73/509 | |||||
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| Number | Date | Patentee | Title | Type | |
| 194,041 | Aug. 14, 1877 | R.K. Huntoon | Improvement in apparatus for regulating the supply of steam to gas-exhausters | ||
| 215,802 | May 27, 1879 | G.H. Corliss | Steam Pumping-Engines | steam pumps | |
| 655,135 | Jul. 31, 1900 | S.F. Butler, G.W. Turner | Automatic Stop for Engines | steam engine governors | |
| 727,466 | May 05, 1903 | E.J. Sederholm | Governor | steam engine governors | |
| 1,526,293 | Feb. 10, 1925 | C.R. Houghton | Governor | machine governors | |