Real world company prefixes
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O& OA OB OC OD OE OF OG OH OI OJ OK OL OM ON OO OP OQ OR OS OT OU OV OW OX OY OZ
ORA ORB ORC ORD ORE ORF ORG ORH ORI ORJ ORK ORL ORM ORN ORO ORP ORR ORS ORT ORU ORV ORW ORX ORY ORZ
OREC OREE OREG OREK OREN OREQ ORER ORET OREU OREX OREY
O& OA OB OC OD OE OF OG OH OI OJ OK OL OM ON OO OP OQ OR OS OT OU OV OW OX OY OZ
ORA ORB ORC ORD ORE ORF ORG ORH ORI ORJ ORK ORL ORM ORN ORO ORP ORR ORS ORT ORU ORV ORW ORX ORY ORZ
OREC OREE OREG OREK OREN OREQ ORER ORET OREU OREX OREY
| 1 | OREX | REA Express | added 10/70; eliminated 4/74 | NRHS | |
| 2 | OREX | *OMAHA REFINING CO. | PWRC | ||
| 3 | OREX | *REA EXPRESS, INC. (RAILWAY EXPRESS AGENCY, INC.) | PWRC | ||
| 4 | OREX | +OREGON DEPARTMENT OF AGRICULTURE | PWRC | ||
| 5 | OREX | Oregon Dept. of Agriculture | 1/1994-7/2005 (not listed) | NAKINA | |
| 6 | OREX | REA Express, Inc. | added 10/1970; added 1/1971; eliminated 4/1974 | NAKINA | |
| 7 | OREX | REA Express, owned and operated by Railway Express Agency, Inc. | eliminated 1/1971 | NAKINA | |
| 8 | OREX | REA Express | added 10/1970 | NAKINA | |
| 9 | OREX | Omaha Refining Co. | 8/1920 | NAKINA | |
| 10 | OREX | Oregon Department of Agriculture | RSRV | ||
| 11 | OREX | OREGON DEPARTMENT OF AGRICULTURE | SCAC4 | ||
| 12 | OREX | Oregon Dept. of Agriculture | 1/94-7/2000 | NRHS |