| 1 | DUFF | DUFFY, TOM COMPANY | | | SCAC4 |
| 2 | DUFM | DUFF, MICHAEL INC | | | SCAC4 |
| 3 | DUFR | DUFRESNE, CLAUDE | | | SCAC4 |
| 4 | DUFS | DUFERCO SHIPPING SA | | | SCAC4 |
| 5 | DUFX | Duffy & Sons, Inc. | 7/2005 (not listed) | | NAKINA |
| 6 | DUFX | Merchants Despatch Transportation Corp. | 1/1950-1/1952; eliminated 4/1954; 7/1954 | | NAKINA |
| 7 | DUFX | Merchants Despatch Transportation Corp. | 1/52; eliminated 4/54 | | NRHS |
| 8 | DUFX | *MERCHANTS DESPATCH TRANSPORTATION CORP. | | | PWRC |
| 9 | DUFX | +DUFFEY & SONS, INC. | | | PWRC |
| 10 | DUFX | Duffy and Sons | | | RSRV |
| 11 | DUFX | DUFFY & SONS | | | SCAC4 |
| 12 | DUFY | DUFRY AMERICA SERVICES INC | | | SCAC4 |
