Piston for Pneumatic Pumps.
Description:
Patent for improvements in pistons for pneumatic pumps by using a combination of a tubular shell, a cylindrical valve, a conical aperture and a conical projection to fulfill the conditions required of a piston in pumps. Illustration is included.
Date:
March 31, 1891
Creator:
Robinson, Charles H.
Partner:
UNT Libraries Government Documents Department