Original oil and gas trade magazine vintage ad for SEISMIC EXPLORATIONS INCORPORATED, Main office was located in Houston, Texas. Also had offices in Midland, Texas, Shreveport, Louisiana and Billings, Montana. Competence, based on twenty-six years of Professional Service. SEI offers a group of experienced personnel, operational and staff. Equipment and technical standards controlled by our own laboratory. This unique 1958 old petroleum oilfield seismic and drilling industry magazine advertisement would display beautifully matted and framed.