12" 45 RPM records: What's the story?

Onhwy61,
Thanks that was interesting. I assume the vinyl details are accurate, although the bit about CD or DVD compared to analog was completely incorrect. (The author is comparing raw analog signals and the raw analog output of CD or DVD very precisely resembles the original analog signal not a staircase. Comparing Digital information directly to its translated Analog counterpart is like comparing the computer binary code for a work of Shakespeare with the analog book and saying that this bunch of ones and zeros clearly has absolutely nothing to do with this work of Shakespeare.)

Onhwy61, yes thanks for an interesting link/article. One of the things that struck me in the description of "twinning" and groove echo, was the fact that these conditions would render the disc defective so that it would not be used for production, and would be redone. Pre-echo from tape print-through however, would find it's way onto the commercial pressings (when it was present on the mastertape that is.)
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Shadorne...Thank you! (for pointing out the inaccuracy of the digital info). I didn't have the heart to do it again.