The lock has a central bar (6) and an auxiliary bar (11), which are transferred from a locking position in to an unlocking position by a central lock (1). The central bar and the auxiliary bar are automatically transferred from an unlocking position in to a locking position with a door wing in a closed position. A lock nut (8) is formed as a splitted lock nut with a nut halve that is assigned to a door outer side, and another nut halve assigned to door inner side. One of the nut halves is blocked by a blocking lever operated with a locking cylinder.
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