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Individual
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Individual
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Publication of GB237268ApublicationCriticalpatent/GB237268A/en
Procedimiento de calcinación de minerales de zinc, de plomo y de plomo y zinc con mezcla de carbonato, sulfato, óxido e hidrato cálcicos naturales o artificiales, en hornos a trabajo manual o mecánico, sin que los minerales de zinc y plomo alteren de modo