FIELD: locking devices. SUBSTANCE: combination of cylindrical lock and key, key and blank for manufacturing of key allow for enhancing degree of protection from unauthorized opening of lock. Key of lock has special-shape groove with cut-out recess in one side surface of key. Made in lock in slot for key is lip of shaped configuration which protrudes downwards and can enter into cut-out recess of special-shape groove. EFFECT: higher efficiency. 33 cl, 32 dwg
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