QQ-B-639B (AMENDMENT 1), FEDERAL SPECIFICATION: BRASS, NAVAL: FLAT PRODUCTS (PLATE, BAR, SHEET, AND STRIP) (18 OCT 1973)

QQ-B-639B (AMENDMENT 1), FEDERAL SPECIFICATION: BRASS, NAVAL: FLAT PRODUCTS (PLATE, BAR, SHEET, AND STRIP) (18 OCT 1973)., The General Services Administration has authorized the use of this amendment, which forms a part of QQ-B-639B, dated 18 October 1973 by all federal agencies.