| 1 | WMBC | WILMOT, BRUCE T | | | SCAC4 |
| 2 | WMBT | WMB TRANSPORTATION | | | SCAC1 |
| 3 | WMBT | WIDEMAN, B TRUCKING | | | SCAC4 |
| 4 | WMBU | WHITE MARTINS GASES INDUSTRIAIS LTD | | | SCAC4 |
| 5 | WMBX | Willbros Terminal Co. | added 10/1967; 4/1970; eliminated 7/1974 | | NAKINA |
| 6 | WMBX | North American Car Corp. | 1/1975; added 4/1975; eliminated 7/1976 | | NAKINA |
| 7 | WMBX | Willbros Terminal Co. | added 10/67; 4/70; eliminated 7/74 | | NRHS |
| 8 | WMBX | North American Car Corp. | 1/75; added 4/75; eliminated 7/76 | | NRHS |
| 9 | WMBX | (NATX) NATX (WILLBROS TERMINAL CO.) | | | PWRC |
