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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 ...
Kellogg company logo as used from the 1920s to the 1950s. The Kellogg Switchboard and Supply Company was an American manufacturer of telecommunication equipment. Anticipating the expiration of the earliest, fundamental Bell System patents, Milo G. Kellogg, an electrical engineer, founded the company in 1897 in Chicago to produce telephone exchange equipment and telephone apparatus.
The new handset became the new standard in the Bell System and was used in refurbishing existing hand telephone sets for reissue as 202-type sets for almost another two decades. In the 1950s, large quantities of old telephones were retired in favor of the popular new model 500 telephone, creating a stock pile of still usable parts. At the same ...
The model 302 telephone is a desk set telephone that was manufactured in the United States by Western Electric from 1937 until 1955, and by Northern Electric in Canada until the late 1950s, until well after the introduction of the 500-type telephone in 1949. The sets were routinely refurbished into the 1960s.
The electric generator of the telephone is wired in sequence to two dry cell batteries so that the instrument can be used to administer electric shocks to another person. The Tucker Telephone was invented by A. E. Rollins, [ 1 ] the resident physician at the Tucker State Prison Farm , Arkansas , in the 1960s.
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Western Electric Co., Inc. was an American electrical engineering and manufacturing company that operated from 1869 to 1996. A subsidiary of the AT&T Corporation for most of its lifespan, Western Electric was the primary manufacturer, supplier, and purchasing agent for all telephone equipment for the Bell System from 1881 until 1984, when the Bell System was dismantled.