Real world company prefixes
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TRAFFIC
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1
GRCX
Granite Rock Co.
added 1/1971; 1/1975-1/1994; 7/2000-7/2005 (not listed)
NAKINA
2
GRCX
Warren Petroleum Corp.
4/1961
NAKINA
3
GRCX
Gulf Oil Corp.
eliminated 7/1961
NAKINA
4
GRCX
Gulf Refining Co.
8/1920-7/1935
NAKINA
5
GRCX
Gulf Oil Corp.
7/1937-10/1957
NAKINA
6
GRCX
Gulf Oil Corp.
4/38-10/57
NRHS
7
GRCX
Warren Petroleum Corp.
Apr-61
NRHS
8
GRCX
Granite Rock Co.
added 1/71; 1/75-7/2000
NRHS
9
GRCX
*GULF OIL CORP. [WARREN PETROLEUM CORP.; GULF REFINING CO.]
PWRC
10
GRCX
+GRANITE ROCK CO.
PWRC
11
GRCX
Granite Rock
RSRV
12
GRCX
GRANITE ROCK CO.
SCAC4