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CORUNDUM ( Data in short of corundum , unless noted ) Domestic Production and Use ... Corundum was used in and polishing optical components , 45 % , fabricated metal ... Import Sources ( 1969 - 72 ) : 100 % . 4 . Tariff : Item Number Rate of Duty / / 14 Statutory and concentrate 519 . 17 Pree ...
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