Sound system equipment. Methods for measuring and specifying the performance of sounders (electroacoustic transducers for tone production)1 Scope and object This International Standard is applicable to sounders, which are treated as entirely passive electroacoustic transducer elements. Piezoelectric diaphragms, which are the principal components of piezoelectric sounders, are also included. Buzzers which are sound sources with built in electric circuits are excluded. The object of this standard is to standardize the definitions relating to these electroacoustic transducers, and to list

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The decision whether the cytb or cox1 gene segment or both are used for fish identification depends on the declared fish species

Organizations seeking confidence from their suppliers that their product requirements will be satisfied

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BS 3641-3 makes recommendations for proportions to be used in the design of symbols

BS EN 1780-2 Aluminium and aluminium alloys

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Heat resistance is the measurement of a temperature difference by which an object or material resists a heat flow