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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 ...
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]
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]
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.
Hot Form Quench (HFQ) is an aluminum hot stamping process for high strength sheet (typically) 2xxx, 6xxx and 7xxx series alloys, [6] that was initially developed in the early 2000s by Professors Jianguo Lin and Trevor Dean at the University of Birmingham and then at Imperial College London, both in the UK.
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