The color looks to be
that as used by the Tenant Co. They manufactured large industrial maintenance equipment. Some so large you could ride on it. The cover is obviously missing which reveals a rather cheap, small motor/fan assembly. Does any one remember the Sanitaires that were bolted together. Two motors, two beater bars, two bags, one handle. Covered about a 24" path. I used to service them when I breifly worked for a maintenance machine repair company.
Rick