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Shall have a copper content of not less than 75%, a tin
content of not less than 6%, and a lead content of not
less than 6% nor more than 11%, and total impurities,
exclusive of zinc, antimony, and nickel of not more
than 0.75%; the antimony content not to exceed
0.50%. Shall be free of lined and unlined standard red
car boxes.
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