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GEORGE J HAGAN Co
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GEORGE J HAGAN Co
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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
C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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FR524854A1920-09-171920-09-17
Improvements in the method for heat treatment and apparatus for this treatment
ExpiredFR524854A
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