Viewing the film caused me to look around for the history of the crystal oscillator (happens). Which led my to this 1948 Bell document ... ' The Evolution of th

Viewing the film caused me to look around for the history of the crystal oscillator (happens). Which led my to this 1948 Bell document ... ' The Evolution of the Quartz Crystal Clock' ... which starts at 1500 B.C. (They were very thorough back then.) https://web.archive.org/web/20110717061023/http://www.ieee-uffc.org/main/history.asp?file=marrison https://web.archive.org/web/20110717061023/http://www.ieee-u...