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...ight=1.35|Flat-screen televisions for sale at a consumer electronics store in 2008]] ...ractice''] p. 48</ref> In the mid-1960s, color broadcasting was introduced in the U.S. and most other developed countries. ...

{{About|the electronic device|experiments in an evacuated pipe|Free fall|the transport system|Pneumatic tube|Blood sampl ...BN|9027248761}}.</ref> is a device that controls [[electric current]] flow in a high [[vacuum]] between [[electrode]]s to which an electric [[voltage|pot ...