THERE were two types of stainless steel in 1912–14, and this is still substantially true; the chromium iron alloys and the chromium nickel iron alloys.
Bull, H. (1936), "Stainless Steels: The Development and Aeronautical Application of the Two Types of Non‐Corrodible Steel", Aircraft Engineering and Aerospace Technology, Vol. 8 No. 2, pp. 51-54. https://doi.org/10.1108/eb030017
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