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Safety of power transformers, power supplies, reactors and similar products. Part 2-12. Particular requirements and tests for constant voltage transformers and power supply units for constant voltage
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Common rye bread sterilized by spirit for prolonged storage. Specifications
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Glass and glass products. Climatic load resistance test methods. Frost resistance test
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Arc welding. Welded joints in pipelines of copper and copper-nickel alloy. Main types, design elements and dimensions
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