Original oil and gas trade magazine vintage ad for CARDWELL MANUFACTURING COMPANY of Wichita, KS. How to cut costs with Slim Hole Drilling. Smaller casing, lower operating costs, cheaper bits, less drilling mud. This unique 1955 oilfield petroleum drilling industry magazine advertisement would display beautifully matted and framed. There is a slight crease on middle of page from binding. Two-page gatefold advertisement.