Original oil and gas trade magazine vintage ad for SILLERS ENGINEERING COMPANY of Dallas, TX. Division of Peerless Manufacturing Company. Scraper Traps and Sillers Flex Ring Closure. Pictured is an installation of a 14 inch ASA Sillers Flex Ring Closure on a Scraper Trap at a pumping station of a major products pipeline company in Eastern Oklahoma. Unique 1955 old petroleum refining industry equipment magazine advertisement. On the reverse side is an ad for TRECO REFINERY ENGINEERING COMPANY of Tulsa, OK. It's Time Top Think Catalytic. Pictured is a graph showing the Trends In Conversion Capacity Related to Total Crude Capacity. Old 1955 petroleum process refining industry equipment magazine advertisement.