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Henry Hapke
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18,672. Hapke, H. Aug. 19. Water levels, indicating.-A float a operates a spindle c connected by toothed gearing with a pointer moving over a graduated scale. The spindle c is also connected by links n, o, p with valves y, z, which allow steam to pass to a whistle when the water level is high or low.
GB190718672D1907-08-191907-08-19An Improved Water-level Indicator and Alarm for Steam Boilers.
ExpiredGB190718672A
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