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LENINGRADSKY ORDENA LENINA I ORDENA TRUDOVOGO KRASNOGO ZNAMENI GORNY INS TITUT IMENI GV
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LENINGRADSKY ORDENA LENINA I ORDENA TRUDOVOGO KRASNOGO ZNAMENI GORNY INS TITUT IMENI GV
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Priority to CA167,918ApriorityCriticalpatent/CA982187A/en
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Publication of CA982187ApublicationCriticalpatent/CA982187A/en