While taking copies in the duplicator_ must be kept in ON position.ASilk carrierBleverCImpression rollerDReceiving plateAnswer: B. lever Read Explanation: Duplicators are used for taking multiple copies of the stenciled matterFirst duplication machine was invented by James Watt ( in 1780 )Duplicator is otherwise known as MulticopierWhile taking copies in the duplicator lever must be kept in ON position. Read more in App