| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F01 | USK | ENGINES OR PUMPS |
| F01 | KL | MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES |
| F02 | KL | COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS |
| F03 | KL | MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR |
| F04 | KL | POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS |
| F15 | USK | ENGINEERING IN GENERAL |
| F15 | KL | FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL |
| F16 | KL | ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL |
| F17 | KL | STORING OR DISTRIBUTING GASES OR LIQUIDS |
| F21 | USK | LIGHTING; HEATING |
| F21 | KL | LIGHTING |
| F22 | KL | STEAM GENERATION |
| F23 | KL | COMBUSTION APPARATUS; COMBUSTION PROCESSES |
| F24 | KL | HEATING; RANGES; VENTILATING |
| F25 | KL | REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES |
| F26 | KL | DRYING |
| F27 | KL | FURNACES; KILNS; OVENS; RETORTS [4] |
| F28 | KL | HEAT EXCHANGE IN GENERAL |
| F41 | USK | WEAPONS; BLASTING |
| F41 | KL | WEAPONS |
| F42 | KL | AMMUNITION; BLASTING |
| F99 | KL | SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01] |