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Priority to JP1986074491UpriorityCriticalpatent/JPH0145172Y2/ja
Publication of JPS61206364UpublicationCriticalpatent/JPS61206364U/ja
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Publication of JPH0145172Y2publicationCriticalpatent/JPH0145172Y2/ja
Method of securely interrupting the electric power supply from a low-frequency or direct voltage source to a load, and appartus for carrying out the method