pdf 506-110-103 i1 Jul67 - Alarm Switches and Security Devices for Coin Collectors Popular
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506-110-103_i1_Jul67_Alarm_Switches_Security_Devices_for_Coin_Coll_ocr.pdf
From New England Telephone Station Installation Handbook, June 1969. Extracted by Sam Etler.
1.01 Alarm switches are devices which are mechanically connected to a lock, door, or upper housing and electrically connected to a local alarm panel or CO.
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