Quote Originally Posted by Bob Parmenter View Post
It used the older centrifugal style supercharger, again I think from McCulloch. Because of their shape they're sometimes called "pie tin" superchargers. Here's a pic on a Graham.
Actually, Bob, the Graham supercharger was designed in house by F.F. Kishline, the company's assistant chief engineer. It was an original design, but was reportedly based on the Duesenberg unit.