| 1 | MWBX | Midwest By-Products Co., a Division of Gilco, Inc. | added 7/1987; 1/1994; eliminated 10/1995 | | NAKINA |
| 2 | MWBX | Midwest By-Products Co. | added 7/1974; 1/1975-1/1980; eliminated 7/1987 | | NAKINA |
| 3 | MWBX | Midwest By-Products Co. | added 7/74; 1/75-1/80; eliminated 7/87 | | NRHS |
| 4 | MWBX | Midwest By-Products Co., a Division of Gilco, Inc. | added 7/87; 1/94; eliminated 10/95 | | NRHS |
| 5 | MWBX | MIDWEST BY-PRODUCTS CO., A DIVISION OF GILCO, INC. | | | PWRC |
| 6 | MWBX | Midwest By-Products | | | RSRV |
