Entrance/office lock with deadbolt - Latchbolt is retracted by knob/lever from either side unless outside is locked by 20° rotation of thumbturn. Deadbolt is thrown or retracted by 90° rotation of thumbturn. When locked, key outside or knob/lever inside retracts deadbolt and latchbolt simultaneously. Outside knob/lever remains locked until thumbturn is returned to vertical position. Throwing deadbolt automatically locks outside knob/lever. Auxiliary latch deadlocks latchbolt when door is locked. Inside knob/lever is always free for immediate egress.
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