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Area code 512 was one of the original area codes established in October 1947. At that time it covered most of the south-central portion of Texas, from the Gulf of Mexico to the Mexican border. Besides Austin, it included San Antonio , Corpus Christi , Brownsville , Harlingen , and McAllen .
The original North American area codes were established by the American Telephone and Telegraph Company ... 512, 713, 915 California: 213, 415, 916 Iowa: 319, 515 ...
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512: Texas (Austin, San Marcos, and parts of central Texas) 1947: 1992: split to create 210; 1999: split to create 361; 2013: overlaid by 737; 513: Ohio (Cincinnati, Middletown, Hamilton, Lebanon, and parts of southern and southwestern Ohio; this area code used to also include Dayton) 1947: 1996: split to create 937; 2023: overlaid by 283; 514
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512 (number), a natural number; Several Ferrari cars: the 512 S and 512 M racing cars, and the 512 BB and 512 BBi, 512 TR and F512 M road cars; 512 Taurinensis, a minor planet orbiting the Sun; The area code 512 (Austin, Texas area) 512th note, a musical note played for 1⁄512 of the duration of a whole note; Site 512, US military radar site ...
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In later years, except for distress traffic, stations shifted to nearby "working frequencies" to exchange messages once contact was established: 425, 454, 468, 480, and 512 kHz were used by ships while the coast stations had their own individual working frequencies.