| More topics under "F21H - Incandescent mantles; Other incandescent bodies heated by combustion" (187) |
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| F21H 1 - Incandescent mantles; Selection of imbibition liquids therefor (150) |
| F21H 3 - Manufacturing incandescent mantles; Treatment prior to use, e.g. burning-off; Machines for manufacturing (23) |
| F21H 5 - Solid incandescent bodies (14) |