State system for ensuring the uniformity of measurements. State primary standard and all-union verification schedule for means measuring volumetric flow of gas within the range of 1x10 in minus 6 up to 1x10 in 2 degree m3/s
State system for ensuring the uniformity of measurements. Acoustics. Reference zero for the calibration of audiometric equipment. Part 7. Reference threshold of hearing under free-field and diffuse-field listening conditions