Duct,Air SVCE (700BC-I)
  700BC/I Use Prior to Serial #3100000
          From #3100000 to #3172039 See 7012912
          Starting With #3172039 See 7024053
  700BC   Use Prior to Serial #3100000
          From #3100000 to #3172039 See 7012911
          Starting With #3172039 See 7024053