D o w n l o a d offer, not printed, not on paper! I offer a collection of 6 patent pages of mechanical music instrument technique of the former wellknown company HUPFELD (Germany) from old US patents on an antique style / vintage style background. The 6 pages show detailed drawings of 6 patents, published between 1913 and 1918 (please see all 6 images of this item description). |