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prior permission required
stresses
avia.
"только по предварительному разрешению"
mil.
требуется предварительное разрешение
mil., avia.
"необходимо предварительное разрешение"
English thesaurus
prior permission required
avia., Canada
An expression used to indicate that permission from the appropriate authority must be obtained before certain aeronautical activities can be carried out
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