Machines fabricants en commençant par la lettre O
| OKUMA | 207 | |
| OKK | 47 | |
| OKUMA HOWA | 27 | |
| OKAMOTO | 23 | |
| OVERBECK | 19 | |
| OMAG | 15 | |
| OERLIKON | 14 | |
| OZAMECH | 11 | |
| O M | 9 | |
| OMV | 9 | |
| OPTIMUM | 9 | |
| OMAX | 7 | |
| ONA | 6 | |
| O-M | 5 | |
| OKUMA CAPTAIN | 5 | |
| OMG ZANOLETTI | 5 | |
| OMG | 4 | |
| OERLIKON MAAG | 3 | |
| OKUMA CADET | 3 | |
| Omcn | 3 |
