FIELD: hardware. SUBSTANCE: the lock has several lock mechanisms located in the casing, which are engageable with one or several locking bolts and through them the lock opens in a definite sequence. Provision is made for one or several inaccessible keyholes, and an access to the inaccessible keylock is provided at lock opening through the accessible keylock. The lock mechanisms are located in a separate casing and can move relative to the lock casing attached to the door, and the access to their keylocks is accomplished through one opening for passage of the key to which they are displaced. EFFECT: enhanced stability to breaking open. 12 cl, 29 dwg
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