winnow

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The focus group students identified most of their peers as Winnowers while fewer students were perceived as Parers.
In the late 1960s, high-speed PVC cylindrical pipes with a felt rubbing on them (to produce static electricity) were mounted on the conveyor belts of winnowers and sifting machines to remove stalk and fiber more efficiently.
It is not easy to summarize the directory section, except to say it starts with blanchers and runs through curd-makers, labelling machines, capping equipment and pulpers to winnowers.