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Protection circuits from dangerous voltages and currents arising at lines of wire broadcasting. General requirements and rules

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Silicocalcium. Method for the determination of silicon

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Silicocalcium. Method for the determination of iron content

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Silicocalcium. Method for the determination of calcium

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Square-head step-point with sphere set screws. Product grades a and b. Construction and dimensions

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Graphic technology. Requirements for colours of tproofing systems

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