May 18 (19 or 21?), 1948 - Columbia Records unveiled its new long-playing, 33 1/3 rpm phonograph record.
Demonstration of Columbia’s new 33-1/3 LP records in Tallahassee, Florida. August 5, 1948.
via Florida Memory

May 18 (19 or 21?), 1948 - Columbia Records unveiled its new long-playing, 33 1/3 rpm phonograph record.

Demonstration of Columbia’s new 33-1/3 LP records in Tallahassee, Florida. August 5, 1948.

via Florida Memory