Electric Head Asst-Dbl, CB,SVCE (ICBDF48,ICBDF60)
 ICBDF48  Use Prior to Serial #17300000
          From #17300000 to #17309466 See 814384
          From #17309466 to #1731250 See 821815.
          Starting With Serial #1731250 See 827174
 ICBDF60  Use Prior to Serial #17300000
          From #17300000 to #17309466 See 814384
          From #17309466 to #1731250 See 821814.
          Starting With Serial #1731250 See 827174