Photograph of nine disc-shaped gas regulator parts in varying sizes created by the Wilgus Manufacturing Company. The parts are metal-cast with embedded inscriptions identifying the company and, on some, the part number, for example: “Wilgus Mfg. Co. L. A. Cal. U.S.A. 787-987,” “Wilgus Mfg. Co. Gas Regulator.” The photograph may have been taken at the Wilgus Manufacturing plant located at 1722 East Sixteenth Street from 1921 to at least 1944.