Word: cheesecloth
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Dates: during 1902-1902
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...make it impossible for any dust to accumulate there are no corners in the building; the usual angles have been rounded off. The heating and ventilation system is of the newest and most efficient type, and provides for freeing the air from all dust by taking it through cheesecloth. The building is heated by hot-air, except for the corridors which are heated by steam and hot water radiators...