>  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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