| More topics under "F27 - Furnaces; Kilns; Ovens; Retorts" (99,096) |
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| F27B - Furnaces, kilns, ovens, or retorts in general; Open sintering or like apparatus (41,740) |
| F27D - Details or accessories of furnaces, kilns, ovens, or retorts, in so far as they are of kinds occurring in more than one kind of furnace (57,356) |