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The GPO introduced the Trimphone in the late 1960s as an alternative to its standard telephone, this new phone featured a distinctive warbling ring as opposed to the traditional bell. Subscribers had to pay extra for the Trimphone. The original design by Martyn Rowlands dates from 1964. It won a COID Design Award in 1966.
In 1964 the GPO placed a contract for 10,000 units. [3] The Trimphone started life in 1964 as the Telephone No. 712, which was usually supplied as a 712L with an alphabetical as well as numerical dial. The Trimphone was the first in the GPO range to use a tone caller which warbled at around 2,350 Hz modulated by ringing current. The volume of ...
The General Post Office (GPO) [1] was the state postal system and telecommunications carrier of the United Kingdom until 1969. [2] Established in England in the 17th century, the GPO was a state monopoly covering the dispatch of items from a specific sender to a specific receiver (which was to be of great importance when new forms of communication were invented); it was overseen by a ...
The British Telecom microwave network was a network of point-to-point microwave radio links in the United Kingdom, operated at first by the General Post Office, and subsequently by its successor BT plc. From the late 1950s to the 1980s it provided a large part of BT's trunk communications capacity, and carried telephone, television and radar ...
This made quality control and supervision of the manufacturing process difficult, when compared to the GPO's experience with cast-iron post boxes, and was an important aspect of the GPO's move towards cast-iron telephone kiosks. Over the years, five foundries were involved in this work for the Post Office.
1971: AT&T submitted a proposal for cellular phone service to the U.S. Federal Communications Commission (FCC). 3 April 1973: Motorola employee Martin Cooper placed the first hand-held cell phone call to Joel Engel, head of research at AT&T's Bell Labs, while talking on the first Motorola DynaTAC prototype.
The New General Post Office, London, 1829, by James Pollard, showing the main west façade on St Martin's Le Grand. Smirke's new General Post Office opened on 23 September 1829. It was the UK's second purpose-built post office; [10] Dublin's GPO (completed in 1818 to a design by Francis Johnston and still in use) predates it. [11]
It was established in July 1982 by the UK government to provide type approval services to the telecommunications terminal industry. At that point in history, British Telecom was a state monopoly, and even by 1982 BT only allowed (via approval) the four British manufacturers (STC, GEC, Plessey, and the "Thorn-Ericsson" partnership) to supply its twenty five types of phone through them, and not ...