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Door coordinators

Function of door coordinator devices on double-leaf door-sets:

the active door-leaf is prevented from closing by the lock-head of the coordinator
hence, the passive door-leaf closes first
and the coordinator releases the active door-leaf
and both the door-leaves have been closed in the correct order.

Active door-leaf:  the door-leaf normally used for passage
Passive door-leaf:  the door-leaf normally not used for passage

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