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closed-circuit television

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 of closed-circuit television
1945-50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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  • I'll probably stick to electric-eye doors, burglar alarms, closed-circuit television systems and things like that.

    Creatures of the Abyss Murray Leinster

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