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* In the late 1970s, Sony demonstrated a prototype digital optical audio disc that was 12 inches in diameter, similar to that of an LP record. The company teamed up with Philips when they learned that both companies were working on digital audio disc technology. The effort eventually became the UsefulNotes/CompactDisc. The connection to the LP remained in early CD packaging prototypes that used mini paperboard LP-style sleeves before switching to the more familiar jewel case.
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* In the late 1970s, Sony demonstrated a prototype digital optical audio disc that was 12 inches in diameter, similar to that of an LP record. The company teamed up with Philips when they learned that both companies were working on digital audio disc technology. The effort eventually became the UsefulNotes/CompactDisc.Platform/CompactDisc. The connection to the LP remained in early CD packaging prototypes that used mini paperboard LP-style sleeves before switching to the more familiar jewel case.
