This video shows how the telephone relay and AR timer each worked in conjunction with the RCM for the Thunderbolt siren. In the video these are shown as two seperate methods for activating the siren.
AR Timer and Telephone Relay
This video shows how the telephone relay and AR timer each worked in conjunction with the RCM for the Thunderbolt siren. In the video these are shown as two seperate methods for activating the siren.
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