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F22B37/00—Component parts or details of steam boilers
F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
F22B37/423—Valves for testing steam generators
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FR456650D1913-04-141913-04-14
Gauge valves for steam boilers, to control excessive rises and falls of the water level in the boilers
ExpiredFR456650A
(en)
Improvements in devices for measuring and indicating the density of water in a steam boiler, or the density of other liquids in evaporative installations