Ross,

     As a manufacturing/process engineer those figures on the fab drawing are
important to me for two occasions:

1. When I need to make some sort of tooling (whatever it may be) to build the
assembly...
it helps to know what kind of tolerences the bare fab is being built to, it
may affect how precise the tooling needs to be.

Or,...

2. Something isn't going right during assembly. For example, placement is
really crappy on
    random boards in a panelized PCB, and I've eliminated all possible causes
on my end, I'd
    like to know if the FAB was built within specifications...

                                                                             -
Steve Gregory-

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