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| All Patents in class 251/152 | |||||
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| Number | Date | Patentee | Title | Type | |
| 122,756 | Jan. 16, 1872 | W. Camerer | Improvement in safety-valves | steam safety valves | |
| 944,330 | Dec. 28, 1909 | M.A. Hudson | Steam safety-valve | steam safety valves | |