Photograph of gas regulator equipment created by the Wilgus Manufacturing Company connected to a boiler in a brick wall. The parts are metal-cast with embedded inscriptions identifying the company, reading “Wilgus Mfg. Co." Identification in raised metal letters on the boiler reads "Pioneer Boiler & Machine Works."
Three men working with gas regulator equipment in a California oil field. The man in the center looks at a gauge and gives a thumbs-up sign to the man on the right. The equipment is probably by the Wilgus Manufacturing Company.