The R.T. Clark Companies, Inc. headquartered in Oklahoma City, Oklahoma, U.S.A. is a full service, international brokerage company servicing the geophysical, geotechnical, engineering, and environmental communities.The R.T. Clark Companies, Inc. provides a full line of New & Used/2nd-hand land equipment for geophysical/geotechnical applications including Recording Systems, Seismic Vibrators, Battery Enclosures, Geophone Singles, Geophone Strings, Cables, Energy Sources, Seismographs, Resistivity Systems, Ground Penetrating Radar, Electromagnetic Systems, Magnetics, and much more. However, as our clients' needs have changed over the years, we have responded by expanding the services we offer. Not only are we the largest "Exclusive Used Equipment Broker" in the geophysical industry, we also sell new equipment, lease a multitude of geophysical acquisition and geotechnical equipment, and conduct appraisals of assets and holdings to satisfy our clients' accounting, financial, and legal needs.