closed circuit tele visions

closed-circuit television

noun
a system of televising by cable to designated viewing sets, as within a factory for monitoring production operations, in a theater for viewing a special event taking place elsewhere, or in an office building as an aid to maintaining security.

Origin:
1945–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
closed-circuit television
 
n
a television system in which signals are transmitted from a television camera to the receivers by cables or telephone links forming a closed circuit, as used in security systems, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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