
    (No. 6672
    Joseph J. Duffy Co., A Corporation, Claimant, vs. State of Illinois, Department of General Services, Respondent.
    
      Opinion filed September 5, 1972.
    
    W. L. Lamey, Attorney for Claimant.
    William J. Scott, Attorney General; Saul R. Wexler, Assistant Attorney General, for Respondent.
   Perlin, C.J.  