On August 31, 1886, Charles W. Weiss of Brooklyn, New York, received a patent (U.S. patent №348437) for an Electro Magnetic Adding Machine. Weiss worked for the Kruse Check & Adding Machine Company in ...
In 1886 the professor of mathematics at the University of Würzburg, Germany, Eduard Selling (1834-1920) (see biography of Selling) received a patent for a calculating machine with very interesting ...