Original oil and gas trade magazine vintage ad for WELEX INC. Main office was located at 1400 East Berry, Fort Worth, Texas. Division offices were located in Dallas TX, Denver CO, Houston TX, Los Angeles CA, Midland TX, New Orleans LA, Tulsa OK and Wichita KS. Here's Proof. An inquiry concerning the Welex Side Wall Coring Service and challenge to back up our statement the you get more and bigger cores with Welex Side Wall coring which means more available data to you. This unique 1958 old oilfield petroleum drilling industry equipment magazine advertisement would display beautifully matted and framed. Welex Jet Services, Inc.