APPEAL FROM THE UNITED STATES DISTRICT COURT FOR THE WESTERN DISTRICT OF OKLAHOMA. No. 433. Argued March 8-9, 1951. Decided May 7, 1951. Appellee owns and operates a pipe line from its refinery in Oklahoma to its terminals in other States. It uses the pipe line solely to carry its own refined petroleum products. No other pipe line or refiner has connections with appellee's line, and no other refiner has ever shipped products through it. At each of its terminals, appellee has storage facilities from