Textiles. Quantitative chemical analysis. Part 21. Mixtures of chlorofibres, certain modacrylics, certain elastanes, acetates, triacetates and certain other fibres (method using cyclohexanon)
State system for ensuring the uniformity of measurements. Optics and photonics. Interferometric measurement of optical elements and optical systems. Part 3. Calibration and validation of interferometric test equipment and measurements
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