You're asking about a revolving tray oven. You could 'net searches on them.
There is currently a picture of one on the home page of "Independent Bakery Equipment Company." However, as a clearing house for used equipment, it may not stay there long. They also have a page dedicated to the type, called there, "oven - Revolving".
As a new member I can't post hyperlinks, so try to figure it out.
the revolving ovens page:
Doing a bunch of searches around revolving tray oven, bakery oven, bakery equipment, commercial ovens, etc. will probably land several leads.