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Priority to JP1985098494UpriorityCriticalpatent/JPH0339746Y2/ja
Publication of JPS627088UpublicationCriticalpatent/JPS627088U/ja
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Publication of JPH0339746Y2publicationCriticalpatent/JPH0339746Y2/ja
Device for triggering an alarm system in the event of insufficiency of the transmission level, for the receiver module of an optical-fiber transmission system