953 nut 66,764 #1 Posted 8 hours ago June 21, 1948 Columbia Records unveils the 33-1/3 rpm LP phonograph record, invented by Peter Carl Goldmark, allowing up to 20 minutes per side (available in 10 and 12-inch diameters) at the Waldorf-Astoria Hotel, NYC; over the next decade, its popularity and profitability push the 78 rpm record out of production. 3 3 Share this post Link to post Share on other sites
