FIELD: security. SUBSTANCE: method involves mounting an identification member between bodies of threaded joint and guarded object in region without direct access. Shape of identification member is altered, when threaded joint is mounted. Hole, which is provided in threaded joint body, provides possibility to record image of deformed identification member. Said image is stored and matched to identification member optical image which is read upon checking. Recording, storage and matching are performed by automatic optical device. EFFECT: simplified design and increased reliability of check operation. 2 cl, 4 dwg
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