As staed above there were several variations on the "chopper". Curtis Cullin gets the credit for a good design, but several units were coming to the same conclusion at about the same time, there was the "salad fork" used by the 746th Tank Battalion, the Douglas Device from the 3rd Armored as well as variations on the Cullin design. These were all worked up and built by Ordnance Maintenance Battalions and other shops, they were hurredly constructed and fitted as quickly as possible.
Gary B.