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Filed: May 25, 1900
Issued: Jan. 1, 1901
Inventor: Lars M. Landing
In 1901, Lars Landing received a patent for a device designed to help individuals quickly calculate the interest on a loan, he described the invention as follows:
"My invention relates to machines for computing interest and time, and has for its object to provide a machine of this class which will enable an operator to readily figure the interest on various principals at various rates and for various times and which will also en able the operator to readily ascertain the time (number of days) between two given dates."
Image taken from U.S. Patent 665,118 - Digitized by Google