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
P& P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 PA PB PC PD PE PF PG PH PI PJ PK PL PM PN PO PP PQ PR PS PT PU PV PW PX PY PZ
PQA PQB PQC PQE PQF PQI PQK PQL PQM PQN PQO PQR PQS PQT PQU PQX
PQCC PQCG PQCL PQCX
1 PQCX The PQ Corp. added 4/1980; 1/1994; eliminated 1/1995; 7/2000-7/2005 (not listed)   NAKINA
2 PQCX PQ Corp. added 4/1978; 1/1980; eliminated 4/1980   NAKINA
3 PQCX Philadelphia Quartz Co. added 1/1971; 1/1975; eliminated 4/1978   NAKINA
4 PQCX Philadelphia Quartz Co. of California 8/1920-7/1923   NAKINA
5 PQCX Philadelphia Quartz Co. of California, Ltd. 7/1930-4/1970; eliminated 1/1971   NAKINA
6 PQCX Philadelphia Quartz Co. of California, Ltd. 4/38-4/70; eliminated 1/71   NRHS
7 PQCX Philadelphia Quartz Co. added 1/71; 1/75; eliminated 4/78   NRHS
8 PQCX PQ Corp. added 4/78; 1/80; eliminated 4/80; 7/2000   NRHS
9 PQCX The PQ Corp. added 4/80; 1/94; eliminated 1/95; 7/2000   NRHS
10 PQCX (PQX) PQ CORPORATION [PHILADELPHIA QUARTZ CO.]     PWRC
11 PQCX PQ Corporation     RSRV
12 PQCX PHILADELPHIA QUARTZ COMPANY OF CALI     SCAC3
13 PQCX PQ CORPORATION     SCAC4