Schultze, Gustav Friedrich Wilhelm, patent for a coin-controlled apparatusGustav Friedrich Wilhelm Schultze, patent for a coin-controlled apparatus. Patented August 8, 1893.Fey, Charles August, patent for a coin-operated weighing scaleCharles August Fey, patent for a coin-operated weighing scale. Patented November 4, 1913Advertisement for Fey’s gum attachmentMagazine advertisement honoring Charles Fey on “his Golden Anniversary in the Coin Machine Business”
Schultze, Gustav Friedrich Wilhelm, patent for a coin-controlled apparatusGustav Friedrich Wilhelm Schultze, patent for a coin-controlled apparatus. Patented August 8, 1893.
Fey, Charles August, patent for a coin-operated weighing scaleCharles August Fey, patent for a coin-operated weighing scale. Patented November 4, 1913
