
    (No. 6442
    International Business Machines Corporation, Claimant, vs. State of Illinois, Division of Highways, Respondent.
    
      Opinion filed April 18, 1972.
    
    International Business Machines Corporation, Claimant, pro se.
    William J. Scott, Attorney General; William E. Webber, Assistant Attorney General, for Respondent.
   Perlin, C.J.  