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Difference Engine No.2, designed by Charles Babbage, built by Science Museum | Science Museum Group Collection
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Difference engine of the Babbage Calculating Machine, invented by Charles Babbage in 1822 Stock Photo - Alamy
Charles Babbage and his calculating engines : selected writings by Charles Babbage and others : Babbage, Charles, 1791-1871 : Free Download, Borrow, and Streaming : Internet Archive
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