| 1 | ECXX | East Carbon Development Co. | added 10/2006 | | NAKINA |
| 2 | ECXX | ECDC Environmental, L.C. | added 1/1995; 7/2000-7/2005; eliminated 10/2006 | | NAKINA |
| 3 | ECXX | East Carbon Development Co. | 1/1994 (not listed) | | NAKINA |
| 4 | ECXX | East Carbon Development Co. | Jan-94 | | NRHS |
| 5 | ECXX | ECDC Environmental, L.C. | added 1/95; 7/2000 | | NRHS |
| 6 | ECXX | EAST CARBON DEVELOPMENT COMPANY (ECDC ENVIRONMENTAL, LC) | | | PWRC |
| 7 | ECXX | ECDC Environmental | | | RSRV |
| 8 | ECXX | EAST CARBON DEVELOPMENT COMPANY | | | SCAC4 |
| 9 | ECXX | East Carbon Development Co. | | USA | TRAFFIC |
