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Significats de multiple switchboard en anglès

Encara no tenim significats per a "multiple switchboard".
Ús de multiple switchboard en anglès
1
For this purpose he designed and installed the first metallic circuit, multiple switchboard to go into service.
Masters of Space / Morse and the Telegraph; Thompson and the Cab...
2
Scribner's multiple switchboard dates from about 1890.
The Age of Big Business: A Chronicle of the Captains of Industry
3
In this period came the multiple switchboard, copper wire, girl operators, underground cables, metallic circuit, common battery, and the long-distance lines.
The History of the Telephone
4
It is known as the " multiple switchboard," an American invention, and is divided into sections, over which the operators preside.
The Story of Electricity
5
263, a more complete mention being made of this feature under the discussion of magneto multiple switchboards, wherein it found its chief use.
Cyclopedia of Telephony and Telegraphy, Vol. 1 / A General Refer...
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