1 | PQX | The PQ Corp | added 4/1980; 1/1994-7/2005 | | NAKINA |
2 | PQX | PQ Corp | added 4/1978; 1/1980; eliminated 4/1980 | | NAKINA |
3 | PQX | Philadelphia Quartz Co. | 8/1920; 7/1930-1/1975; eliminated 4/1978 | | NAKINA |
4 | PQX | Philadelphia Quartz Co. | 4/38-1/75; eliminated 4/78 | | NRHS |
5 | PQX | PQ Corp | added 4/78; 1/80; eliminated 4/80 | | NRHS |
6 | PQX | The PQ Corp | added 4/80; 1/94-7/2000 | | NRHS |
7 | PQX | PQ CORPORATION [PHILADELPHIA QUARTZ CO.] | | | PWRC |
8 | PQX | PQ Corporation | | | RSRV |
9 | PQX | PQ CORPORATION | | | SCAC4 |