| Oerlikon Fairfield | E4.647 | |
| Oerlikon Graziano SPA | E6.116 | |
| Off Highway Research | E7.307 | |
| OFM Top Line s.r.l. | E6.703 | |
| Oleoweb SRL | E6.109 | |
| OMCI (Modena) | E6.223 | |
| OMSI Transmission S.P.A | ?安玛驰传动技术有限公司 | E5.436 |
| OMT Group (Luen) | E6.114 | |
| OP | E1.318 | |
| Original Korea Technology Co., Ltd. | E6.327 | |
| Ortlinghaus-Werke GmbH | E2.212 | |
| Ostim End?striyel Yatirimlar ve Isletme A.S. | E7.339 | |
| Outset SRL | E6.117 |
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