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Keywords: Charles Vander Woerd's Automatic Screw-making Machine.JPG Charles Vander Woerd's Automatic Screw-making Machine circa 1871-1876 invented for the American Watch Company Waltham Massachusetts USA This machine could make any size watch screw; one operator could attend six of these machines to give a combined output of 50-60 000 screws per day Own 2009-03-28 Daderot Public domain Screw-making machines Waltham Watch Company |