
    (No. 6758
    Data Products Corporation, Claimant, vs. State of Illinois, Department of Revenue, Respondent.
    
      Opinion filed September 7, 1972.
    
    Data Products Corporation, Claimant, pro se.
    William J. Scott, Attorney General; William E. Webber, Assistant Attorney General, for Respondent.
   Perlin, C.J.  