Real world company prefixes

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M n O P Q R S T U V W X Y Z Ø
D D& D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF DG DH DI DJ DK DL DM DN DO DP DQ DR DS DT DU DV DW DX DY DZ
DDA DDB DDC DDD DDE DDF DDG DDH DDI DDJ DDK DDL DDM DDN DDO DDP DDQ DDR DDS DDT DDU DDV DDW DDX DDY
DDDB DDDC DDDE DDDI DDDN DDDT DDDU DDDV DDDX DDDY
1 DDDX Frontier Cooperative Co. added 4/1991; eliminated 10/1992; 1/1994-7/2005 (not listed)   NAKINA
2 DDDX Frontier Cooperative Co. added 4/91; eliminated 10/92; 1/94-7/2000   NRHS
3 DDDX FRONTIER COOPERATIVE COMPANY [RETIRED 11-30-92 ATP]     PWRC
4 DDDX Frontier Cooperative     RSRV