A machine that makes a duplicate of a paper document.  Xerox invented the photocopy process, which scans a sheet of paper to capture an image of its contents.  The first Xerox copiers in the late 1950s were analog and used a mirror to reflect the image onto the drum.  Subsequent copiers became digital scanners that are also used to transfer documents into digital files on the computer.
An Actual "Copy of a Photo"
Machines in the early 1900s from the Rectigraph Company and Photostat Corporation created an actual photograph of the document.  See 
Xerox and 
computers are copy machines.