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Regulatory document. Water hardness. Measurement technique using trilon B titrimetric method
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Design guidelines for urban public utility electrical networks (with amendments as of 29.06.1999)
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Guidelines on the protection of 6-1150 kV electrical circuits against lightning and internal overvoltages. All 3 parts
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Standard instruction for metering electricity in its production, transmission and distribution
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Recommendation. State system for ensuring the uniformity of measurements. Metrological characteristics of measuring instruments. Nomenclature. Principles for regulatory activity, identification and control
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