TM 9-2330-388-24P used in the breakout shown on the illustration figure, which is prepared for a functional group,  subfunctional group, or an assembly.  A "V" appearing in this column in lieu of a quantity indicates that the quantity is variable and the quantity may vary from application to application. 4.  Explanation of Columns (Section IV). a. NATIONAL STOCK NUMBER (NSN) INDEX. (1) STOCK  NUMBER  column.    This  column lists   the   NSN   by   National   Item   Identification   Number (NIIN) sequence.  The NIIN consists of the last nine NSN digits of the NSN (i.e., 5305-01-674-1467 ). NIIN When using this column to locate an item, ignore the first 4 digits of the NSN.  However, the complete NSN should be used when ordering items by stock number. (2) FIG.      column.      This    column    lists    the number of the figure where the item is identified/located. The   figures   are   in   numerical   order   in   Section   II   and Section III. (3) ITEM column.  The item number identifies the item associated with the figure listed in the adjacent FIG.    column.    This  item  is  also  identified  by  the  NSN listed on the same line. b. PART  NUMBER  INDEX.    Part  numbers  in  this index are listed by part number in ascending alphanumeric   sequence   (i.e.,   vertical   arrangement   of letter   and   number   combination   which   places   the   first letter   or   digit   of   each   group   in   order   A   through   Z, followed by the numbers 0 through 9 and each following letter or digit in like order). (1) CAGEC   column.      The   Commercial   and Government    Entity    (CAGE)    Code    (C)    is    a    5-digit alphanumeric   code   used   to   identify   the   manufacturer, distributor,  or  Government  agency,    etc.,  that  supplies the item. (2) PART   NUMBER   column.      Indicates   the primary  number   used   by   the   manufacturer   (individual, firm, corporation, or Government activity), which controls the design and characteristics of the item by means of its engineering    drawings,    specifications    standards,    and inspection  requirements  to  identify  an  item  or  range  of items. (3) STOCK  NUMBER  column.    This  column lists    the    NSN    for    the    associated    part    number    and manufacturer    identified    in    the    PART    NUMBER    and CAGEC columns to the left. (4) FIG.      column.      This    column    lists    the number of the figure where the item is identified/located in Section II and III. (5) ITEM  column.    The  item  number  is  that number  assigned  to  the  item  as  it  appears  in  the  figure referenced in the adjacent figure number column. c. FIGURE AND ITEM NUMBER INDEX. (1) FIG.      column.      This    column    lists    the number of the figure where the item is identified/located in Sections II and III. (2) ITEM  column.    The  item  number  is  that number  assigned  to  the  item  as  it  appears  in  the  figure referenced in the adjacent figure number column. (3) STOCK  NUMBER  column.    This  column lists the NSN for the item. (4) CAGEC   column.      The   Commercial   and Government    Entity    (CAGE)    Code    (C)    is    a    5-digit alphanumeric   code   used   to   identify   the   manufacturer, distributor,  or  Government  agency,    etc.,  that  supplies the item. (5) PART   NUMBER   column.      Indicates   the primary  number   used   by   the   manufacturer   (individual, firm, corporation, or Government activity),  which controls the design and characteristics of the item by means of its engineering    drawings,        specifications    standards    and inspection  requirements  to  identify  an  item  or  range  of items. 5.  Special Information. a. USABLE    ON    CODE.        The    usable    on    code appears in the lower left corner of the Description column heading.  Usable on codes are shown as UOC:...." in the Description    column    (justified    left)    on    the    first    line following applicable item description/nomenclature. Uncoded items are applicable to all models. Identification of the usable on codes used in the RPSTL are: Code Used On WAT Model M1098 b. FABRICATION INSTRUCTIONS.  Bulk materials required   to   manufacture   items   are   listed   in   the   Bulk Material Functional Group of this RPSTL.  Part numbers for bulk materials are also referenced in the Description column    of    the    line    item    entry    for    the    item    to    be manufactured/fabricated. Detailed fabrication instructions  for  items  source  coded  to  be  manufactured or fabricated are found in TM 9-33388-24P. 4