On This Day in Telephone History July 13TH 1912 a British Strowger Automatic Telephone Exchange, known as 'Official Switch’, was opened for service at the General Post Office in London England. Supplied and installed by the Automatic Telephone Manufacturing Company Ltd of Liverpool, it was a private branch exchange and had an initial 900 lines with a maximum capacity of 1,500 lines.

On This Day in Telephone History July 13TH 1912

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On This Day in Telephone History July 13TH 1912 a British Strowger Automatic Telephone Exchange, known as ‘Official Switch’, was opened for service at the General Post Office in London England.

Supplied and installed by the Automatic Telephone Manufacturing Company Ltd of Liverpool, it was a private branch exchange and had an initial 900 lines with a maximum capacity of 1,500 lines.

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