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| All Patents in class 137/56 | |||||
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| Number | Date | Patentee | Title | Type | |
| 237,354 | Feb. 01, 1881 | A.B. Wood | Steam Governor | steam engine governors | |
| 627,700 | Jun. 27, 1899 | H.E. Menier | Governor for Motor Engines | steam engine governors | |