| ReturnTo Theme-Group-Choice | Onelevelup |
| 3L039 | Heat generation or utilization not through chemical reaction or combustion | |
| F24T10/00 -50/00;F24V30/00-99/00 | ||
| 3L039 | Heat generation or utilization not through chemical reaction or combustion | |
| F24T10/00 -50/00;F24V30/00-99/00 | ||