| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F03 | KL | MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR |
| F03H | UKL | PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR (from combustion products F02K) |
| F03H 1/00 | HGR | Use of plasma to produce a reactive propulsive thrust (generating plasma H05H 1/00) [1, 2006.01] |
| F03H 3/00 | HGR | Use of photons to produce a reactive propulsive thrust [1, 2006.01] |
| F03H 99/00 | HGR | Subject matter not provided for in other groups of this subclass [2009.01] |