Waltham Watch Company

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available from Wikipedia or other free sources online. The Waltham Watch
Company, also known as the American Waltham Watch Co. and the American
Watch Co., produced about 40 million high quality watches, clocks,
speedometers, compasses, time fuses and other precision instruments
between 1850 and 1957.In 1850, Roxbury, Massachusetts, David Davis,
Edward Howard and Aaron Lufkin Dennison formed together the company that
would later become the Waltham Watch Company. The revolutionary business
plan was to manufacture the movement parts so precisely that they would
become fully interchangeable.