pdf C54.912 IA NY Call Box Circuits - Bridged Leased Lines [RCA] Popular

Published on 17 December 2010 By Anonymous 742 downloads

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C54.912 IA NY Call Box Circuits - Bridged Leased Lines [RCA]

Mar 49. Also coded F92.310. The call boxes are used to summon messengers from message centers maintained by RCA. Includes addendum Issue A, Dec 49 covering alternate installation method using a floor bunching block..

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