Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Hitachi Ltd
Original Assignee
Hitachi Ltd
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Filing date
Publication date
Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP7940175ApriorityCriticalpatent/JPS524196A/en
Publication of JPS524196ApublicationCriticalpatent/JPS524196A/en
PURPOSE: The failt of return of a testing cock of an air tube distribution type fire sensor is prevented detecting the operation of a electrical contact provided on a testing switch cock.
COPYRIGHT: (C)1977,JPO&Japio
JP7940175A1975-06-271975-06-27Air tube distribution type fire sensor
PendingJPS524196A
(en)