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The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [ 1 ] In 1950, the boundaries of the numbering plan area were redrawn to produce a division of the northern and central parts along a north–south ...
Hot stamping (also known as press hardening, hot press forming, or hot forming die quenching) is a relatively new technology which allows ultra-high strength steels (typically 22MnB5 boron steel [1]) to be formed into complex shapes, which is not possible with regular cold stamping operations. [2]
In the 19th century, hot stamping became a popular method of applying gold tooling or embossing in book printing on leather and paper. [5] The first patent for hot stamping was recorded in Germany by Ernst Oeser in 1892. [2] From the 1950s onward, the method became a popular means of marking plastic . [4]
Numbering plan areas in California (blue) and border states. This map is clickable; click on any region shown to visit the page for those area codes.Area code 510 is shown in red. Area codes 510 and 341 are telephone area codes in the North American Numbering Plan (NANP) serving much of the East Bay in the U.S. state of California.
On December 31, 2005, customers began dialing 1 + area code + seven-digit number whenever a call is placed by a caller in the 310 or 424 area code to any other area code, including 310 to 424 or 424 to 310. After July 26, 2006, customers were required to use the new 1 + area code + seven-digit number dialing procedure for all calls, although ...
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Area code 415 was assigned to central California, south of area code 916, and north of area code 213. It stretched from Sacramento in the north to Bakersfield in the south. [2] In 1950, the boundaries of the numbering plan area were redrawn to produce a division of the northern and central parts along a north–south-running dividing line.
Toll-free telephone service is a telecommunication service in which subscribers are assigned telephone number in NPAs 800, 888, 877, 866, 855, 844, and 833. Calls to these numbers incur no toll charges for callers. The American Telephone & Telegraph Company (AT&T) first introduced 800 toll-free service in 1967. [2]