Hi Ralph & Kyle & All,

Ralph complemented the DAT which led Kyle to ask what means DAT which
led Ralph to answer Dictionary of American Toolmakers. That's what a lot
of other people also call it, but it's not quite correct. It's really
the Directory of American Toolmakers. The difference is  mainly only
relevant if you're trying to find it on a listing or such, but I offer
this in case any here might do that. 

Best Wishes,
Bob