National Supply Company of Pittsburgh, Pennsylvania, manufactured this portable drilling machine about 1910-12 with a rated depth of 2,500 feet and advertised it as “The Rig that Displaced The Old Standard (wooden) Derrick.” It and similar rigs were widely used to drill shallow holes until portable spudders displaced them in the 1920's, but this one remained in use until 1972. The Woodcock Brothers of Bradford, Pennsylvania, used it between 1960 and 1972 to drill 39 wells to an average depth of 1600 ft., and in 1972 the Pennzoil Company used it in breaking ground for their Houston office.