I found this centrifugal blower up for sale, the seller says it's a "Caroll Mach II supercharger".
http://i19.ebayimg.com/01/i/01/47/cc/5d_1.JPG
http://i21.ebayimg.com/02/i/01/47/67/94_1.JPG
I personally have never heard of such a blower, but some of you guys know much more about these parts than I do. Any ideas what this was used for?
Thanks,
Simon