4. Radiant energy
  5. Geological testing or irradiation

Ruhrkohle Aktiengesellschaft

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Apparatus for detecting the cutting horizon for mining machines

Radiant energy – Geological testing or irradiation
Patent

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Apparatus for servicing coke ovens

Distillation: apparatus – Apparatus – Types
Patent

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Coal charging in a coal gasification installation

Gas: heating and illuminating – Processes – Coal
Patent

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Coal gasification reactor

Gas: heating and illuminating – Generators – Cupola
Patent

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Coal hydrogenation process with integrated refining stage

Mineral oils: processes and products – By treatment of solid mineral – e.g. – coal liquefaction – etc. – Plural hydrogenation steps
Patent

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