vintage datacenter furniture

[Benjamin Huntsman]

This is sort-of off topic, but not entirely...
I've seen a fair amount of furniture like in the following picture:

http://dooki.com/supercomputers/ibm/ibm.s390g4.gif

It looks well-made, industrial, and vintage (sort of).  Anyone know who makes such things?

Did IBM have a go-to desk manufacturer for their stuff, or just whatever the customer provided?

Thanks!

-Ben