Telephone, lineman's telephone

Keybridge House was built in the 1970s to house both an international and an inland telex exchange. Keybridge was also designed as a trunk telephone exchange (an exchange that connects other exchanges) for London and the South East and as a telephone service centre where a large team of engineers was based. In 1984 Keybridge became a state-of-the-art international digital telephone exchange.

As Keybridge was a service centre this lineman's telephone would have been used by a field engineer working in London. The sticker on the top indicates that it was used by more than one engineer and also contains a joke that it was the engineer's 'mobile phone'. The 704B was first issued to engineers by Post Office Telecommunications in 1973.