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Operation of a Western Electric 551A PBX Switchboard

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1920 | 1930 | 1940 | Teléfono
This video identifies and explains the components of the 551A PBX cord switchboard and demonstrates how intra-PBX, outgoing and incoming calls are processed.

Timestamps:
00:30 History. 02:54 Overview of the face panel.
18:42 Inside the rear of the switchboard.
25:15 How to operate the switchboard.
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