State system for ensuring the uniformity of measurements. State verification chain for measuring instruments of length and signal propagation time in optical fiber, average power, attenuation and wavelength of optic radiation for fiber-optical communication and data transmission systems
Electrical apparatus for explosive gas atmospheres. Part 1. Construction and verification test of flameproof enclosures of electrical apparatus. First supplement. Appendix D. Method of test for ascertainment of maximum experimental safe gap
Nature protection. Atmosphere. Method for determining the amount of drops carried after apparatus for wet scrubbing of dust and gases have been operated
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