4. Chemistry of inorganic compounds
  5. Hydrogen or compound thereof
  6. Elemental hydrogen

Donald M. Richardson

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Chess clock

Horology: time measuring systems or devices – Time interval – With alternately operating indicators
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Process for thermochemically producing hydrogen

Chemistry of inorganic compounds – Hydrogen or compound thereof – Elemental hydrogen
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Thermochemical process for the production of hydrogen using chro

Chemistry of inorganic compounds – Oxygen or compound thereof
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