The nature conservancy. Hydrosphere. The accounting of measurement accuracy of controlled parameters in assessment of water quality compliance with statutory requirements
State system for ensuring the uniformity of measurements. Acoustics. Reference zero for the calibration of audiometric equipment. Part 3. Reference equivalent threshold sound pressure levels of bone vibrators for pure tones
Electrical apparatus for use in the presence of combustible dust. Past 1:2. Electrical apparatus protected by enclosures and surface temperature limitation. Selection, installation and maintenance
€10
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