pdf B899.321 iA Jan37 - NY Tel - Notes on 551-type PBX Switchboards Popular

Published on 13 February 2011 Modified on 15 April 2018 By Anonymous 1625 downloads

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B899.321 iA Jan37 - NY Tel - Notes on 551-type PBX Switchboards

Issue A, January 1937, NY Tel. Manhattan. Contributed by Steve Cichorsky.

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