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I think e.g. Pilawskii´s book and Gunston´s Encyc...Russian Aircraft refer to "chromansil" caps (booms) which I interprete to mean HGSA steel (or HMA, don´t remember which is which). I think the Czech MBI book by Milos Vestsik refers to the same.
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"No man, no problem." Josef Stalin possibly said...:-)
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