Define “PBX”

On Wednesday, March 14, 1956, Helen got a job in Minneapolis at the Century Theater as PBX Operator.  She had PBX experience from her early days in Osceola as a telephone operator, and as switchboard operator at Muscatine County Hospital, but had to learn theater practices.  It turns out she only worked there for a week, saying she wasn’t busy enough and too much traffic.
(Answer: Private Branch eXchange.  A switchboard, as shown below.)

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