Significados de multiple switchboard em inglês

For this purpose he designed and installed the first metallic circuit, multiple switchboard to go into service.

Scribner's multiple switchboard dates from about 1890.

In this period came the multiple switchboard, copper wire, girl operators, underground cables, metallic circuit, common battery, and the long-distance lines.

It is known as the " multiple switchboard," an American invention, and is divided into sections, over which the operators preside.

263, a more complete mention being made of this feature under the discussion of magneto multiple switchboards, wherein it found its chief use.