On what date was the 12 inch LP released?
Beginning in 1939, Dr. Peter Goldmark and his staff at Columbia Records and at CBS Laboratories undertook efforts to address problems of recording and playing back narrow grooves and developing an inexpensive, reliable consumer playback system. It took about eight years of study, except when it was suspended because of World War II. Finally, the 12-inch (30 cm) Long Play (LP) 33 1⁄3 rpm microgroove record album was introduced by the Columbia Record Company at a New York press conference on June 18, 1948.
In the 1980s to early 1990s, there was a CBS imprint label in the US known as CBS Associated Records. Tony Martell, veteran CBS and Epic Records A&R Vice President was head of this label and signed artists including Ozzy Osbourne, the Fabulous Thunderbirds, Electric Light Orchestra, Joan Jett, and Henry Lee Summer. This label was a part of (Epic/Portrait/Associated) wing of sub labels at CBS which shared the same national and regional staff as the rest of Epic Records and was a part of the full CBS Records worldwide distribution system.