Original oil and gas trade magazine vintage ad for PETROLEUM RECTIFYING COMPANY OF CALIFORNIA. Was located in Los Angeles, CA. The Official Oil Doctor At Your Service. Let Him Test Your Crude, Make Recommendations, and Submit Figures. Petreco Process of Electrical Dehydration. This unique 1927 old petroleum refining and process equipment and services magazine advertisement would display magnificently matted and framed. Approximate size 8 x 12 inches