what is the use of winnowing machine

Your friends are correct,

Winnowing machine is an equipment used for separation of grains from the chaff. The separation is done with the help air moving with speed in a particular direction.

@Others....Good work..Keep posting!

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Winnowing-Machine, is a Contrivance, employed for separating, by an artificial current of air, the chaff from the grain, after it has been thrashed out of the straw.......

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 After harvesting , the chaff is thrashed out of the grain , for this the best equipment is wonnowing machine . It involves air for seperating grain.

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