What did Peter Carl Goldmark invent

LP record
Peter Carl Goldmark (Hungarian: Goldmark Péter Károly) (December 2, 1906 – December 7, 1977) was a German-Hungarian engineer who, during his time with Columbia Records, was instrumental in developing the long-playing microgroove 33-1/3 rpm phonograph disc, the standard for incorporating multiple or lengthy recorded works on a single disc for two generations.

The LP was introduced by Columbia's Goddard Lieberson in 1948. Lieberson was later president of Columbia Records from 1956–71 and 1973–75.

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