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key item
comp.	елемент-ключ m (в базах даних)
mil., logist.	обов'язковий предмет
English thesaurus
key item
mil., logist.	Item the lack of which or the faultiness of which on a piece of equipment or weapon system leads to the unavailability of the latter, by making it impossible to fulfil one of the functions planned in its military data sheet. (FRA)