F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
F27B19/00—Combinations of different kinds of furnaces that are not all covered by any single one of main groups F27B1/00 - F27B17/00
F27B19/04—Combinations of different kinds of furnaces that are not all covered by any single one of main groups F27B1/00 - F27B17/00 arranged for associated working