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LP record. The LP (from "long playing" [ 1] or "long play") is an analog sound storage medium, specifically a phonograph record format characterized by: a speed of 33⁄ rpm; a 12- or 10-inch (30- or 25-cm) diameter; use of the "microgroove" groove specification; and a vinyl (a copolymer of vinyl chloride acetate) composition disk.
By the time RCA Victor unveiled it, the 45 was now competing with the 10-inch and 12-inch 33 1 ⁄ 3 rpm microgroove vinyl "LP" (Long Play) discs introduced by arch-rival Columbia Records in the early summer of 1948. In heavy promotion, RCA Victor sold compact, inexpensive add-on and stand-alone units that played the 45 rpm format exclusively.
A record press is a machine for manufacturing vinyl records. It is essentially a hydraulic press fitted with thin nickel stampers which are negative impressions of a master disc. [ 1] Labels and a pre-heated vinyl patty (or biscuit) are placed in a heated mold cavity. Two stampers are used, one for each of side of the disc.
In the production of phonograph records – discs that were commonly made of shellac, and later, vinyl – sound was recorded directly onto a master disc (also called the matrix, sometimes just the master) at the recording studio. From about 1950 on (earlier for some large record companies, later for some small ones) it became usual to have the ...
The use of vinyl to cover the roofs of regular automobiles was to "give fixed-roof cars some of the flair and appeal of their convertible counterparts." [3] An example is the 1928 - 1929 Ford Model "A" Special Coupe, featuring a roof completely covered with a vinyl-like material. This Model "A" Special Coupe's vinyl roof had two exposed seams ...
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