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> I suppose it's simply a question of cleverly allocating combinations
> of pin assignments to locks and keys. I can imagine at least one simple
> way of achieving a hierarchy of master keys with pin locks:
Our office keys have the normal jagged key cut for the pins in the lock, but
then they also have another "key" feature engraved on the side, like a
series of recesses drilled at certain points. Maybe some locks only work on
one set of features, or some on both, I don't know.
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