System of product quality indices. Pressure gauges, vacuum gauges, pressure-and-vacuum gauges, brought gauges, head gauges, draught-and-head gauges. Nomenclature of indices
Noise of machine. Determination of power levels of noise sources using sound pressure. Survey method using an enveloping measurement surface over a reflecting plane
Electrical installations of buildings. Part 5. Selection and erection of electrical equipment. Section 534. Devices for protection against surge overvoltages
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