who invented the compact disc - EAS
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Compact disc - Wikipedia
History of the CD: 40 years of the compact disc - CBBC Newsround
What is a Compact Disc? - Computer Hope
CD player - Wikipedia
The history of the CD’s rise and fall | Digital Trends
Disque compact — Wikipédia
Blokart - fun, fast, compact
Tesla vs Edison - Who Really Invented the Light Bulb?
The history and development of batteries - Phys.org
Music Technology of the 1970s: A Timeline - Pitchfork