Today’s Patent- Adding and Listing Machine

Calculator is a small, handy device which is found almost everywhere. This small device helps in calculation and thus solves various problems and saves a lot of time. In 21st August 1888 William S Burroughs got patent over his workable “Adding and Listing Machine” with Patent number US388116.

He also formed a Company with three other men to market his machine. This invention is used for mechanically assisting arithmetical calculations; and it consists of a series of independent keys and intervening connections constructed, arranged, so as to indicate upon the register the sum of any series of numbers by the proper manipulation of the keys, and also so as to print or permanently record the final result.

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