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State system for ensuring the uniformity of measurements. Acoustics. Reference zero for the calibration of audiometric equipment. Part 1. Reference equivalent threshold sound pressure levels of pure tones for supra-aural earphones
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Cutting sleeves for tools with cylindrical sank. Design and dimensions
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Petroleum and natural gas industry. Subsea production systems. Design of submarine umbilical end elements. General provisions
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Household and similar electrical appliances. Safety. Part 2-81. Particular requirements for foot warmers and heating mats
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