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Publication of BE641921ApublicationCriticalpatent/BE641921A/fr
C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
C21D3/02—Extraction of non-metals
C21D3/08—Extraction of nitrogen
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Shielding Devices Or Components To Electric Or Magnetic Fields
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