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DE957299C
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Process for the production of very pure elemental boron
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US2794708A
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Method for the production of a substantially pure boron
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GB747287A
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Improvements in or relating to the production of boron
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DE949768C
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Process for the production of streams of difficult-to-melt metallic or non-metallic materials
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DE936745C
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Process for the production of elemental boron
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DE931233C
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Walking beam conveyor device in annealing furnaces for moving goods
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DE918066C
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Device for generating slow movements by means of hydraulic pressure bodies
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DE880282C
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Separation of tantalum and niobium from the anion-forming metals of the 3rd, 4th, 5th and 6th groups of the periodic table and from silica
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DE908198C
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Process for processing cobalt-nickel-copper dishes
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DE848036C
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Process and device for the production of the carbides of metals which can be used for hard metal alloys, in particular titanium, and of boron carbide
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CA561505A
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Process for the production of elementary boron
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