Original oil and gas trade magazine vintage ad for SOUTHWESTERN INDUSTRIAL ELECTRONICS COMPANY. was located at 2831 Post Oak Road, Houston, TX. Specialize in just one thing, the Design and Manufacture of quality Seismograph Instruments. SIE is actually a working partner with geophysical departments and contractors. More and more operators are finding it both economical and efficient to employ the complete research and laboratory facilities of SIE rather than to maintain extensive facilities of their own to support a few scattered crews. This unique 1951 old petroleum oilfield Seismic equipment magazine advertisement would display beautifully matted and framed.