Pan, Burner-30 Dual Fuel,SVCE(SRT304,DF304,GR304)
  DF304   Use Starting With Serial #17000000.
          Prior to Serial #17000000 See 816739.
  GR304   Use Prior To Serial #18488614
          Starting With #18488614 See 829216
  SRT304  Use From #17000000 to #18483782
          Prior to #17000000 See 816769
          Starting With #18483782 See 829216