I want to know the answer to the following question:
How long did it take Columbia to produce a consumer friendly long play record?
All the background I'm provided with is that "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.". Is that enough to answer the question?
Answer: no