PCIP & Foundry Co SEWER Cover Rubbing in Ontario, California

I can find no information about the PCIP & Foundry Company. Their SEWER covers with this design are found scattered across the greater Los Angeles metropolitan area. This design is the most common for sewer systems built in the 1920s and probably the 1930s.

Original cover after cleaning

Mission Boulevard and Euclid Avenue, looking south towards Mission