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Cut natural emeralds (inserts in jewelry). Classification. Requirements for sorting and grading
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Means of measurement for linear and angular dimensions. Safety requirements and test methods
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Hand-held motor-operated electric tools. Safety. Part 2-21. Particular requirements for drain cleaners
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Oil products transportation on the main trunk pipeline system. Basic principles
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State system for ensuring the uniformity of measurements. Standard platinum resistance thermometers of the first and second grades. Methods of calibration
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Small air-moving devices for information technology and telecommunication equipment. Noise and vibration test codes. Part 2. Structure-born vibration measurements
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