| 301 | Oil Storage Tank | Company Product |
| 302 | Oil Storage Terminals | Company Product |
| 303 | Oil-Suction Pumps | Company Product |
| 304 | Oil Sump | Company Product |
| 305 | Oil Sump Bolt | Company Product |
| 306 | Oil Sump Gasket | Company Product |
| 307 | Oil Sump Hose | Company Product |
| 308 | Oil Tank Hose | Company Product |
| 309 | Oil Test Sets | Company Product |
| 310 | Oil Treatment | Company Product |
| 311 | Oil Type Filter Element | Company Product |
| 312 | Oil-Water Separation System | Company Product |
| 313 | Oil-Water Separators | Company Product |
| 314 | Oil Well Casings | Company Product |
| 315 | Oil Well Cement | Company Product |
| 316 | Oil Well Cementing | Company Product |
| 317 | Oil Well Cementing Equipment | Company Product |
| 318 | Oil Well Drill Bits | Company Product |
| 319 | Oil Well Drilling | Company Product |
| 320 | Oil Well Drilling Bits | Company Product |
| 321 | Oil Well Drilling Mud | Company Product |
| 322 | Oil Well Drilling Mud & Additives | Company Product |
| 323 | Oil Well Equipment & Supplies | Company Product |
| 324 | Oil Well Equipment & Supplies Rental | Company Product |
| 325 | Oil Well Packings | Company Product |
| 326 | Oil Well Services | Company Product |
| 327 | Oiler | Company Product |
| 328 | Oilers | Company Product |
| 329 | Oilfield Chemicals | Company Product |
| 330 | Oilfield Chokes | Company Product |