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Events calendar
Cathode-Ray Tube Day
What is? : It is a day to commemorates the invention of Cathode-Ray Tube.
Also called :
When is? : December 20
Frequency : Annual
Observed by : USA
Where it is celebrated / observed? : Nationwide
Origin :
#HashTag : #CathodeRayTubeDay
About : It is a vacuum tube which contains one or more electron guns and a phosphorescent screen that used to view images.
Country : UNITED STATES
