PNST 419-2020

Packaging and the environment. Energy recovery

Primary batteries. Part 1. General

Sorted waste of used woolen and half-woolen textile materials. Specification

Mortars. General specifications

Statistical methods. Guidelines for implementation of statistical process control. Part 1. Elements

State system for ensuring the uniformity of measurements. Acoustics. Reference zero for the calibration of audiometric equipment. Part 2. Reference equivalent threshold sound pressure levels of pure tones for insert earphones