| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F21 | USK | LIGHTING; HEATING |
| F21 | KL | LIGHTING (electric aspects or elements, see section H, e.g. electric light sources H01J , H01K , H05B) |
| F21H | UKL | INCANDESCENT MANTLES; OTHER INCANDESCENT BODIES HEATED BY COMBUSTION (arrangements thereof F21V 36/00; burners F23D) |
| F21H 1/00 | HGR | Incandescent mantles; Selection of imbibition liquids therefor |
| F21H 1/02 | UGR1 | | . | characterised by the material thereof |
|
| F21H 1/04 | GEL | (transferred to F21V 19/06) |
| F21H 3/00 | HGR | Manufacturing incandescent mantles; Treatment prior to use, e.g. burning-off; Machines for manufacturing |
| F21H 5/00 | HGR | Solid incandescent bodies (incandescent mantles F21H 1/00) |