19th April 1927, Page 70
19th April 1927
Page 70
Page 70, 19th April 1927
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A New Method Of Case-hardening Steel.
A Résumé of Recently Published Patent Specifications. R HEINISCHE METALLIVAAREN UND MASCHINENFABRIK, of Dusseldorf-Derendorf, in specifications Nos. 242,978 and 244,431,......