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Filed: Apr. 8, 1902
Issued: May 30, 1916
Inventor: Holmes Marshall
Assignees: John T. Underwood
In 1916, inventor Holmes Marshall received a patent for a machine designed to be both a typewriter and calculator. In his patent, he described the invention as follows:
"The object of this invention is to provide a combined typewriting and computing machine in a form which shall require very little and very simple connecting mechanism in addition to usual typewriting and computing mechanism. More specifically, the object is to provide intermediate mechanism between a computing machine and a book typewriter, wherein the type-writer proper travels both across the page and down it."
Image taken from U.S. Patent 1,185,520 - Digitized by Google