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Electromagnetic compatibility of technical equipment. Immunity to variation of power frequency. Requirements and test methods
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Oscillator, modulator and regulation tubes with anode dissipated power above 25 W. Methods of measurements of thermionic control grid current
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Information technology. Open systems interconnection. Basic reference model. Part 2. Security Architecture
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Sound system equipment. Electroacoustical transducers. Measurement of large signal parameters
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Reprography. Micrography. Readers and reader-printers. Types
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