This article has a section on Bradshaw in relation to Toroidal engines. Admittedly outside outside the scope of amusement machines, but interesting non the less.
http://www.douglas-self.com/MUSEUM/POWE ... C.htm#brad

Looks like a Myers Road Test

Case is different; though could have been re-cased.

The shares Shefras machine did appear for about an hour on YouTube and was removed

It was removed to allow an extra section of footage to be incorporated. So, now back on line with an extra 3 minutes added at the end.

Brenco Ring Vendor