what is classisc restricted numbered key system

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HIGH SECURITY Primus/Primus XP: In addition to six cuts for standard locking mechanism, there are five side finger pins to operate the secondary sidebar lock. Primus keys will operate non-Pri...
Falcon Standard Bitting Specs - 018 system Falcon Restricted Bitting Specs - 025 system
Letter of Authorization (LOA) allows restricted product to be purchased.   Restricted product sample LOA.   Bitting list sample LOA.
A PO from a distributor with a letter of authorization from the end user.
All of the Everest D sections/keyways are restricted.