Mountain States Resources Corp. said it has acquired 100 percent interest of RDI Systems Inc., a California corporation, for 3.3 million shares of common stock.

RDI Systems is a petroleum engineering firm specializing in pressure transient testing. RDI is headquartered in Ventura, Calif., with branch offices in Denver, Salt Lake City and Mt. Pleasant, Mich.Pressure transient testing is a rapidly evolving science which requires the use of electronic instrumentation to collect and process well pressure, time and temperature data.

RDI markets precision quartz crystal instruments for well testing combined with Reservoir Data Interpreter software.