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Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
16 July 1920: World's first radiotelephone service commences public service between Los Angeles and Santa Catalina Island. [23] 11 April 1921: Opening of deep sea cable from Key West, Florida, to Havana, Cuba (115 miles). [23] 22 December 1923: Opening of second transcontinental telephone line via a southern route. [23]
In the 1920s the Bell System crushed independent unions, replacing them with company unions that did not negotiate contracts. After 1929, the Great Depression hit the industry hard, as telephone service was easy to discontinue when family income dropped. The Bell System found payrolls were the easiest place to save money, and its work force ...
Present-day Baja California of Mexico was misrepresented in early maps as an island.This example c. 1650. Restored. The first European explorers, flying the flags of Spain and of England, sailed along the coast of California from the early 16th century to the mid-18th century, but no European settlements were established.
The carbon microphone was also used in radio broadcasting and public address work through the 1920s. 1896 telephone . In the 1890s a new smaller style of telephone was introduced, the candlestick telephone, and it was packaged in three parts. The transmitter stood on a stand, known as a "candlestick" for its shape.
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On December 25, 2020, a bombing in Nashville, Tennessee, caused AT&T service outages across the U.S., but primarily in Middle Tennessee. Cellular, wireline telephone, Internet, and U-verse television services were affected due to infrastructure damage to an AT&T service facility located near the blast site. [100] [101]
The history of California can be divided into the Native American period (about 10,000 years ago until 1542), the European exploration period (1542–1769), the Spanish colonial period (1769–1821), the Mexican period (1821–1848), and United States statehood (September 9, 1850–present).