The Golden era to SuperDiscs or Audiophile vinyl started in the mid 70's. Lot of firms took place in the race, manufacturing everything from direct cutting to HSM(half speed mater) Superdiscs.
The presentation is mostly about the technical part of the issue, and the firms who were present from the start.
Recording theories and techniques, definitions, illustrations, and explanations on the subject are found on most of the pages.
Manufacturers of SuperDiscs:
Supplementary info in later updates.