4. E - Fixed Constructions
  5. 21
  6. B

Efim V. Kreinin

E - Fixed Constructions – 21 – B

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Method for underground gasification of fuel

E - Fixed Constructions – 21 – B
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Method of connection of wells

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Method of mine-less connection of wells

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Method of processing coal channels in underground coal...

E - Fixed Constructions – 21 – B
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Method of underground gasification of a coal bed

E - Fixed Constructions – 21 – B
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