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History of Computing
An Encyclopedia of the People and Machines that Made Computer History
Copyright © 1982-2000, Lexikon Services "History of Computing" ISBN 0-944601-78-2
This is a square hole punch for floppy disk jackets. Punching out a square hold
where the write-protect tab would be, allowed older style 5-1/4 inch diskettes to be
flipped over so that data could be stored on the other side of the floppy disk as well.