They reuse numbers for what I call "marketing
numbers". For example,
with a LaserJet 8150dn, the "8150" is a "marketing number" and not
the
actual HP product number, which was C4267A. As far as I know they've
never actually reused a product number.
The same occurs with IBM type numbers and feature numbers. IBM
generally does a good job making the distinction, but resellers do
not.
--
Will