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| ORO | Oroya Mining Ltd | |
| ORO | Office of Research Oversight | |
| ORO | Oil Recovery Operations | |
| ORO | Only Representative Organisation | |
| ORO | Oregon Registry Online | |
| ORO | Oil red O | |
| ORO | Onde Radio Ovest | |
| ORO | Oak Ridge Operations | |
| ORO | Operations Research Office | |
| ORO | Optimal Room Occupancy | |
| ORO | Off Road Only | |
| ORO | Off Road Ohio | |
| ORO | Officina Riparazioni Oslavia | |
| ORO | One Reference Only | |
| ORO | Off-Site Response Organization | |
| ORO (ORA) | Office of Regional Operations (ORA) | |
| OROA | OroAmerica, Inc. | |
| OROB | One Road One Belt | |
| OROB | Oracle Retail Order Broker | |
| OROB | One Race One Blood | |
| OROB | Overall Risk Of Bias | |
| OROC | Ohio Roadsters Owners Club | |
| OROCA | Off Route Obstruction Clearance Altitude | |
| OROM | Optical Read Only Memory | |
| OROM | Option Rom |
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