| 271 | Oil Pipe Connector | Company Product |
| 272 | Oil Pipe Head | Company Product |
| 273 | Oil Pollution Controls | Company Product |
| 274 | Oil Pressure Gauges | Company Product |
| 275 | Oil Pressure Motor Bearings | Company Product |
| 276 | Oil Pressure Switches | Company Product |
| 277 | Oil Proof Packings | Company Product |
| 278 | Oil Pump Gasket | Company Product |
| 279 | Oil Pump Nozzle | Company Product |
| 280 | Oil Pumps | Company Product |
| 281 | Oil Pumps Overhaul | Company Product |
| 282 | Oil Pumps Repair | Company Product |
| 283 | Oil Purifiers | Company Product |
| 284 | Oil Quenching Services | Company Product |
| 285 | Oil Recovery Systems | Company Product |
| 286 | Oil Rectifiers | Company Product |
| 287 | Oil Refineries | Company Product |
| 288 | Oil Refiners Equipment & Supplies | Company Product |
| 289 | Oil Resistant Adhesives | Company Product |
| 290 | Oil Resistant Paints | Company Product |
| 291 | Oil Rig Builders | Company Product |
| 292 | Oil Sampling Equipment | Company Product |
| 293 | Oil Seal | Company Product |
| 294 | Oil Seals | Company Product |
| 295 | Oil Separator | Company Product |
| 296 | Oil Separators | Company Product |
| 297 | Oil Spill Containment Systems | Company Product |
| 298 | Oil Spill Dispersants | Company Product |
| 299 | Oil Spout | Company Product |
| 300 | Oil Stick | Company Product |