Lid for electric arc furnace for melting steel - has arched main-part and central parts of fire resistant material with iron@ plate seamlessly surrounding central part with air-gap... von WENDT, PETER, UMBERG, FRIEDRICH, WAHLERS, FRANZ-JOSEF, 4670 LUENEN, DE, SIEG, JURI, 4600 DORTMUND, DE, FLEMMING, HEINRICH, 4630 BOCHUM, DE

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