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I never actually used my Centurion for cleaning, I was afraid of snapping the plastic drive shaft in the front nozzle.  Some parts of the machine (like the plastic motor housing) were made unnecessary flimsy.  My question is, were the Mark III and Centurion the only models Bison made?  Were there any other colors besides the brown and "Dual Sanitronic green?"  Also, when did the Bison first come out?  I know around 1983 was the swansong....