No. 72-1243. August 22, 1973. Rehearing and Rehearing En Banc Denied November 19, 1973. Joseph F. Canterbury, Jr., Smith, Smith, Dunlap Canterbury, Dallas, Tex., for plaintiff-appellant. William L. Keller, Allen Butler, Dallas, Tex., amicus curiae. David Richards, Austin, Tex., for defendant-appellee. Louis Sherman, Washington, D.C., amicus curiae. Appeal from the United States District Court for the Northern District of Texas. Before MORGAN, CLARK and INGRAHAM, Circuit Judges. LEWIS R. MORGAN, Circuit