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Patent for a complex cupping pump

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Patent for a complex cupping pump.jpg Principle of the helicopter, drawing by Leonardo da VinciThumbnailsParis 1607Principle of the helicopter, drawing by Leonardo da VinciThumbnailsParis 1607Principle of the helicopter, drawing by Leonardo da VinciThumbnailsParis 1607Principle of the helicopter, drawing by Leonardo da VinciThumbnailsParis 1607Principle of the helicopter, drawing by Leonardo da VinciThumbnailsParis 1607Principle of the helicopter, drawing by Leonardo da VinciThumbnailsParis 1607Principle of the helicopter, drawing by Leonardo da VinciThumbnailsParis 1607

Patent for a complex cupping pump, J. A. Maxam, 1916. (From patent specifications, U.S. patent 1179129.)