4. Metallurgical apparatus
  5. Means for treating ores or for extracting metals
  6. By means applying heat to work, e.g., furnace
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Dardart Jean-Michel

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Davis, Jr. William L.

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de Boer Riekelt

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Degner Frederick M.

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Delaitre Lucien

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Deng Xiao-Bao

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Derucki Julian D.

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Dhelft Patrick

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Diener Arnulf

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Dieuloufet Jean-Claude

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Dosda Hubert

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Dufour Alain

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Dunaevsky Leonid Markovich

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Dunham H. E.

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Dyatlov Andrey Mikhailovich

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Eichinger Frithjof

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Elder Arthur L.

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Elsasser Harold B.

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Empco (Canada) Ltd.

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Engel Arno

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