Record Type 4 - Index to Alternative Feature Identifiers

     Field   BV  Fmt  Type  Beg  End  Len  Description
        RT   No    L     A    1    1    1  Record Type
   VERSION   No    L     N    2    5    4  Version Number
      TLID   No    R     N    6   15   10  TIGER/Line ID, Permanent Record Number
      RTSQ   No    R     N   16   18    3  Record Sequence Number
     FEAT1   No    R     N   19   26    8  Line Additional Name Identification Number, First
     FEAT2  Yes    R     N   27   34    8  Line Additional Name Identification Number, Second
     FEAT3  Yes    R     N   35   42    8  Line Additional Name Identification Number, Third
     FEAT4  Yes    R     N   43   50    8  Line Additional Name Identification Number, Fourth
     FEAT5  Yes    R     N   51   58    8  Line Additional Name Identification Number, Fifth



