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Ericsson Radio Systems AB was the name of a wholly owned subsidiary in the Ericsson sphere, founded on 1 January 1983 by buying out all former owners of Svenska Radioaktiebolaget (SRA). The company was well known in Scandinavia and elsewhere in the 1980s, as it was deploying NMT systems and developing a line of mobile telephones under the brand ...
Many early manual telephones had an attached hand-cranked magneto that produced an alternating current (AC) at 50–100 V for signaling to ring the bells of other telephones on the same (party) line, and to alert an operator at the local telephone exchange. These were most common on long rural lines served by small manual exchanges which did ...
Interest in Morris Beitman's "Most Often Needed Radio Diagrams" resurfaced in the early 1980s with the rise of restoring antique and collectible radios made before the 1940s. Vintage Radio, founded by Morgan E. McMahon, was a publishing company specializing in preserving early radio and television technology. [ 8 ]
The Enhanced Digital Access Communication System (EDACS) is a radio communications protocol and product family invented in the General Electric Corporation in the mid 1980s. . The rights were eventually bought by Harris Corporation, which eventually stopped manufacturing these devices in 2012, and ended all service in 20
With manual service, the customer lifts the receiver off-hook and asks the operator to connect the call to a requested number. Provided that the number is in the same central office, and located on the operator's switchboard, the operator connects the call by plugging the ringing cord into the jack corresponding to the called customer's line.
HS 25 (modified from the Ericsson OL-100 system with double relays and 25-point selector (Ericsson license), mainly used for small villages and towns in the counties) HS 31 (new developed register system, introduced in 1931, based on a new flat type relay and a 100-point two-motion selector, suitable for small and large exchanges)
[citation needed] As large cities had both manual and automatic exchanges for many years, the numbers for manual or automatic exchanges used the same format, which could be either spoken or dialed. [10] In the late 1940s, telephones were redesigned with the numbers and letters displayed on a ring outside the finger wheel to provide better ...