Civil defense. Engineering and technical equipment of civil defense protective structures. Hermetic valves. General technical requirements. Test methods
System of product quality indices. Pressure gauges, vacuum gauges, pressure-and-vacuum gauges, brought gauges, head gauges, draught-and-head gauges. Nomenclature of indices
Building acoustics. Estimation of acoustic performance of buildings from the performance of elements. Part 4. Transmission of indoor sound to the outside
