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Arsenic‏

Published at: 10/06/2013
Arsenic‏
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Barium

Published at: 23/06/2013
It is an element of grey/white color usually intermixed in nature with sulfur or with carbon and oxygen. It is used the industry in order to drill better in the mud. Barium keeps drilling machinery
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Beryllium

Published at: 10/06/2013
beryllium
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Cadmium

Published at: 10/06/2013
Cadmium
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