
    No. 538.
    Keller et al., trading as Howard Manufacturing Co., v. United States.
    
      Oscar H. Brinkman and Charles E. Swanson for petitioners.
    
      Acting Solicitor General Stern, Assistant Attorney General Burger, Melvin Richter and Benjamin Forman for the United States.
   United States Court of Appeals for the District of Columbia Circuit. Cer-tiorari denied.  