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1988-12-29
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1989-04-26
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1986-02-05
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1989-05-24
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1991-03-28
Method of and apparatus for detecting level of molten metal
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1990-01-25
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1999-11-03
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1990-10-31
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1990-09-26
Method and apparatus for refining molten metal
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1988-07-20
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1992-08-27
Method and apparatus for producing molten metal from powder state ore
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1990-04-29
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1989-09-27
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1991-10-15
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1990-11-28
Method of refining an alloy
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1990-09-15
Method of processing metal waste
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1990-11-15
Method for azoting of metals and ferro- alloys
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1990-05-14
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1988-03-16
Precious metal refining
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1982-12-23
Method of treating melted metallurgical slag
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1982-12-11
Method of treating melted metallurgical slag
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1990-01-22
Method of recultivating furnace waste dump heaps
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1992-10-15
Method of and device for amalgamation of ferreed contacts
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1991-04-08
Method of and system for direct ore and noble metal
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1989-07-14
Device for processing and refining of liquid metal alloys