1) how do UK 7" pressings get the label logos, text and credits pushed into the center for the labels and the standard copyright info embossed out on the inner trail of wax?
and
2) in the 70s both Capitol and Warner Bros. 7"s amongst a few other labels, had this crazy ridged center right before the label, what caused this and how did they do it?
chew on that one and spit it back out if you would oh knowledgeable ones
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