Standard RINGS, FLASH WELDED Non-Austenitic Corrosion Resistant Steels 1952-11-01 HISTORICAL AMS7493A
Standard RINGS, FLASH WELDED Non-Austenitic Corrosion Resistant Steels 1956-02-01 HISTORICAL AMS7493C
Standard RINGS, FLASH WELDED Non-Austenitic Corrosion Resistant Steels 1955-03-01 HISTORICAL AMS7493B