DUPLEX PROCESSES, OPEN HEARTH FURNACES (STEEL PRODUCTION)
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BTMULTIPLEX PROCESS, OPEN HEARTH FURNACES (STEEL PRODUCTION)
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UDC669.183.57
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Descriptor GERDUPLEXVERFAHREN, SIEMENS-MARTIN-ÖFEN (STAHLHERSTELLUNG)
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Descriptor ENGDUPLEX PROCESSES, OPEN HEARTH FURNACES (STEEL PRODUCTION)
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Descriptor FREPROCÉDÉ DUPLEX, FOURS SIEMENS-MARTIN (FABRICATION DE L'ACIER)