From hardybing23@gmail.com@21:1/5 to All on Sun Jul 30 00:21:37 2017
My new website
classicalmusicreferences.com
has a page for each of 4 RCA Records processes 1) Gruve Gard, 2) Miracle Surface, 3) Dynaflex, 4) Dynagroove {under construction}.
Lots of details on what these are and when used.