On Wed, 29 Mar 2017 15:38:59 -0400, "Mr. Luddite"
wrote:

The computers were "industrial" rated, but I am not sure what that meant
other than they were supposed to be physically "rugged".

The IBM "industrial" PCs had filters on the fans and usually more fans
(assuming higher ambient temps). The cases were a little more
industrial looking. Other than that they were pretty much the same
inside.