4. Heating
  5. Work chamber having heating means
  6. Having means by which work is progressed or moved mechanically

Donald P. Hoover

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Calciner screw construction

Heating – Work chamber having heating means – Having means by which work is progressed or moved mechanically
Patent

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Rotary retort heat treating furnace seals

Metallurgical apparatus – Means for treating ores or for extracting metals – By means applying heat to work – e.g. – furnace
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