1 | SOGX | The Shamrock Oil and Gas Corp. | 1/1952-10/1966; eliminated 4/1968 | | NAKINA |
2 | SOGX | Diamond Shamrock Corp. | added 4/1968; 4/1970-1/1980; eliminated 1/1984 | | NAKINA |
3 | SOGX | Diamond Shamrock Chemicals Co. | added 1/1984; eliminated 7/1984 | | NAKINA |
4 | SOGX | The Shamrock Oil and Gas Corp. | 1/52-10/66; eliminated 4/68 | | NRHS |
5 | SOGX | Diamond Shamrock Corp. | added 4/68; 4/70-1/80 | | NRHS |
6 | SOGX | Diamond Shamrock Chemicals Co. | eliminated 7/84 | | NRHS |
7 | SOGX | (DAX) DIAMOND SHAMROCK CHEMICALS COMPANY [SHAMROCK OIL & GAS CORP.] | | | PWRC |
8 | SOGX | Diamond Shamrock Chemicals | | | RSRV |