Though these numbers were originally intended for internal use by a record pressing plant you can use them to. Lp jacket front cover. A matrix number is an alphanumeric code and on occasion other symbols stamped or handwritten or a combination of the two into the run out groove area of a phonograph record this is the non grooved area between the end of the final band on a record s side and the label also known as the run off groove area end groove area matrix area or dead wax.
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