Abstract: A method and machine are disclosed for screen printing acid-resist mirror inversion images in registration on opposite sides of a metal web with a degree of precision sufficient to permit the incorporation of screen printing techniques in the fabrication of lead frames, electromagnetic core laminations, and other metal plate products by chemical milling processes. A matched pair of upright screen stencils supported in spaced relation on opposite sides of the web is provided with a cooperable pair of squeegees for printing through the image areas of the stencils. The directly opposed squeegees are mounted on a common reciprocable carriage for conjoint movement such that printing on opposite sides of the web is effected synchronously. In preferred forms, a web drive is provided for incrementally advancing the web between the stencils and for holding the web under tension during printing.

Abstract: A method for electroplating a selective area of a part is disclosed comprising the steps of rotating a disc having an absorbent upper surface, maintaining electrolytic solution on the absorbent upper surface of the disc. While such disc is charged anodically and the part is charged cathodically, the part is passed across a chord of the circle within which the disc rotates with the selective area of the part in contact with the electrolytic solution on the rotating disc.