1
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Material Type: Patente
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Crude oil recovery
United States 1966
Sem texto completo
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2
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Material Type: Patente
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Procedure to recover sulfur
United States 1966
Sem texto completo
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3
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Material Type: Patente
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Procedure to recover crude oil from a permeable underground formation
United States 1966
Sem texto completo
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4
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Material Type: Patente
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Procedure to heat an underground formation
United States 1967
Sem texto completo
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