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1978-04-24
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1978-07-17
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1977-10-10
Method for the construction of one thread-core
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METHOD OF HYDROGENIZATION OF COAL
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1978-05-22
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1980-01-03
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1977-12-31
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1978-09-30
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1978-03-28
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1977-08-09
PILLAR
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1978-07-17
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1978-07-31
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1978-06-05
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1976-08-15
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1978-05-08
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1976-08-25
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1977-02-28
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