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Priority to JP1980144687UpriorityCriticalpatent/JPS6318871Y2/ja
Publication of JPS5767175UpublicationCriticalpatent/JPS5767175U/ja
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Publication of JPS6318871Y2publicationCriticalpatent/JPS6318871Y2/ja
F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING