Question

Copying and duplicating machines

25 Aug 2017
Answer :
Word Count : 171

The word copying denotes reproduction. The mechanical device which facilitates reproduction are called copying machines. Copies can be obtained either by manual operation or mechanical operation. The mechanical devices like typewriter, rotary machine and photostat copying machines are used to save labour and time during the course of reproduction. Among all copying machines typewriter was the oldest type of machine operated manually

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