| Y/M/D | Description | Place |
|---|---|---|
| 1931/00/00 | The RCA Victor Division invents Vitrolac for use with radio transcription discs. Vitrolac, or Victrolac, is a vinyl that is not as brittle or as hard as the common shellac disc. | Building 17, RCA Victor Company, Camden Plant, Camden, NJ |
| 1932/00/00 | RCA Victor develops an improved type of phonograph record on Vitrolac disc that provides a 30 minute recording created by slowing down the turn-table speed from 78 to 33.3 rpm. Fidelity is improved by almost doubling the number of grooves. | Building 17, RCA Victor Company, Camden Plant, Camden, NJ |
| 1932/02/00 | Capable of running for a full half-hour, the new long-playing record reproduces entire symphonies and vaudeville and musical comedy acts with-out the necessity of changing the discs. - Modern Mechanics | Building 17, RCA Victor Company, Camden Plant, Camden, NJ |
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