4. Chemistry of inorganic compounds
  5. Modifying or removing component of normally gaseous mixture
  6. Carbon dioxide or hydrogen sulfide component

David G. Frost

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Fuel cell electrocatalyst support comprising an ultra-fine chain

Chemistry: electrical current producing apparatus – product – and – Having earth feature
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Method of removing hydrogen sulfide from gases utilizing a zinc

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Carbon dioxide or hydrogen sulfide component
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