Original oil and gas trade magazine vintage ad for BUCYRUS-ERIE COMPANY of South Milwaukee, WI. Tractor-Type Crawler Offer Greater Mobility to Oil Pipeline. Advantages for traveling over rugged and steep terrain. Performance reports on 15-B and 22-B excavators equipped with the crawlers prove the value of this mounting on pipe line jobs. This unique 1955 oilfield petroleum pipeline industry tractor equipment magazine advertisement would display beautifully matted and framed.