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| All Patents in class 91/255 | |||||
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| Number | Date | Patentee | Title | Type | |
| 54,090 | Apr. 24, 1866 | G.H. Babcock, S. Wilcox, Jr. | Improvement in cut-off valves | steam engine valves | |
| 255,136 | Mar. 21, 1882 | B. Brazelle | Cut-off valve | steam valves | |