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>> 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.
They call it a "beater bar", apparently. These's a little switch to
deactivate it. (It's actually just a lever that pulls the drive belt
tight or slack.)
>> 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.
The laws of thermodynamics seem to suggest this wouldn't work too well...
> Or have the engine part outside, and a long pipe :-)
Apparently that's how the first vacuum cleaners worked...
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