> Hmm, ours has a spinning brush on the underside. The one time somebody run 
> over the cable, it chewed up the insulation on it. :-/

Oh, mine doesn't have the spinny brush bit on the main unit, only at the end 
of the pipe.

>> And no, not gasoline powered. Electric is already loud enough. :)
>
> Heh. Just imagine, a petrol-powered vacuum cleaner... Surely your house 
> would end up more dirty than when you started! :-D

Nah, you just store the exhaust on-board in a canister, then dispose of it 
once it's full.  Or have the engine part outside, and a long pipe :-)

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