Sales tax: exemptions; motor and aviation fuel sales; exempt. Amends secs. 6a, 6c & 25 of 1933 PA 167 (MCL 205.56a et seq.) & adds secs. 4gg & 4ii.  TIE BAR WITH: HB 5583'20 , HB 5584'20 , HB 5585'20 , HB 5586'20