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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