Communication aids for blind persons. Identifiers, names and assignation to coded character sets for 8-dot Braille characters. Part 1. General guidelines for Braille identifiers and shift marks
State system for ensuring the uniformity of measurements. Acoustics. Reference zero for the calibration of audiometric equipment. Part 5. Equivalent threshold sound pressure levels for pure tones in the frequency range 8 kHz to 16 kHz
