Since then the office areas have been used for a variety of purposes, including a police substation and a telephone switchboard.
If the telephone switchboards were overloaded, people who call 911 should get priority.
Where those ended, a portable telephone switchboard was set up, with an operator.
A talk with the young woman at the telephone switchboard in the Swift plant brought out a new point.
The telephone switchboard was 66 feet long and required 35 operators.
The building houses what was considered to be the largest telephone switchboard at the time.
He moved over to the telephone switchboard and tried the various lines; it was all dead.
The main office features a functioning manual telephone switchboard that is still in use.
In 1880, the first telephone switchboard came to Dallas, linking the water company and the fire station.
The military version of Enigma was provided with a plug board, like an old telephone switchboard.