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Air Surveillance ['ɛə ,sə:'veɪl(ə)ns]
mil., abbr.	AS
air surveillance ['ɛə ,sə:'veɪl(ə)ns]
mil., logist.	The systematic observation of air space by electronic, visual or other means, primarily for the purpose of identifying and determining the movements of aircraft, friendly and enemy, in the air space under observation. (FRA)

Air Surveillance: 1 phrase in 1 subject

Transport

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