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pdf CO Equipment Training, Lesson 6, PBX Systems Popular

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CO_Equip_Lesson_6_PBX_tci_bm.pdf

1. History and Development
2. General Description of PBXs
    506, 551, 552A, 605A, 606A, 701A, 702A, 711A, 740, 750A, 755A, Braille PBX

Contributed by John Novack

pdf WE Idle Trunk And Position Indicating Equipments Aug28 Popular

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Idle_Trunk_and_Position_Indicating_Equipments_Apr29_tci.pdf

WE Idle Trunk And Position Indicating Equipments Aug28

August 1928, reprinted April 1929.  Contributed by John Novack.

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