keying locks alike

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Von Duprin does not supply cylinders keyed alike.   Cylinders keyed alike are available from Schlage and Falcon.
Conventional Cylinders - A conventional cylinder is one that requires some breakdown of the lock in order to be removed. These are the most commonly used cylinders sometimes called key-in-lever...
When you want to periodically disable and block access to a certain room in a building or an entrance door, that’s when you would need to use a Lockout Cylinder. See full document.
Locknetics company supplied electro-magnetic locking devices, electronic smart locks, and electronic security components to access control dealers and lock smiths.  Ingersoll-Rand acquired ...
All lock cylinders on a specific project are operable by a special "project key".  Duplicates of this key may be assigned by the building contractor to workmen and subcontractors as required. ...