| 28921 | Blow-out prevention apparatus (manufacture) |
| 28921 | Borers (mining machinery) (manufacture) |
| 28921 | Bridge plugs (manufacture) |
| 28921 | Cage plant for mining (manufacture) |
| 28921 | Casing hangars (manufacture) |
| 28921 | Coal cutter (manufacture) |
| 28921 | Coal plough (manufacture) |
| 28921 | Coal preparation plant (manufacture) |
| 28921 | Continuous miner (manufacture) |
| 28921 | Conveyor for underground mining (manufacture) |
| 28921 | Crushing machine for mining (manufacture) |
| 28921 | Cutting machinery for coal or rock (manufacture) |
| 28921 | Dinting machine for mining (manufacture) |
| 28921 | Drill bits for well drilling (manufacture) |
| 28921 | Drilling jars for mining (manufacture) |
| 28921 | Earth boring machine (manufacture) |
| 28921 | Elevators with continuous action for underground use (manufacture) |
| 28921 | Hauling engine for mining (stationary) (manufacture) |
| 28921 | Heading machine for mining (manufacture) |
| 28921 | Iron roughnecks (manufacture) |
| 28921 | Liner hanger equipment (manufacture) |
| 28921 | Loader for mining (manufacture) |
| 28921 | Machinery for treating minerals by screening, sorting, separating, washing, crushing (manufacture) |
| 28921 | Mineral cutter (manufacture) |
| 28921 | Mineral dressing plant (manufacture) |
| 28921 | Minerals treatment machinery (manufacture) |
| 28921 | Mining machinery (manufacture) |
| 28921 | Mining tool (bit) (manufacture) |
| 28921 | Moles for mining (manufacture) |
| 28921 | Motion compensation equipment for oil drilling rigs (manufacture) |
| 28921 | Mudline suspension and tie-back equipment (manufacture) |
| 28921 | Petroleum drilling equipment (manufacture) |
| 28921 | Pit bottom machinery (manufacture) |
| 28921 | Powered roof support for mining (manufacture) |
| 28921 | Production riser tensioners (manufacture) |
| 28921 | Production riser tie-back equipment (manufacture) |
| 28921 | Ranging drum shearer for mining (manufacture) |
| 28921 | Riser connector apparatus (manufacture) |
| 28921 | Road ripper for mining (manufacture) |
| 28921 | Rock cutting machinery (manufacture) |
| 28921 | Rock drilling machinery (manufacture) |
| 28921 | Rocker shovel for mining (manufacture) |
| 28921 | Roof support (hydraulic) (manufacture) |
| 28921 | Rotary tables (manufacture) |
| 28921 | Sinking machine for mining (manufacture) |
| 28921 | Skip plant for mining (manufacture) |
| 28921 | Stowing machine for mining (manufacture) |
| 28921 | Track laying tractors and other tractors used in mining (manufacture) |
| 28921 | Tunnelling machine for mining (manufacture) |
| 28921 | Well drilling equipment (manufacture) |
| 28921 | Wellhead running tools (manufacture) |
| 28921 | Wellheads (manufacture) |
| 28921 | Winding machine for mining (manufacture) |
| 28921 | |