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PDF Standards BS 3680-9A:1971

Methods of measurement of liquid flow in open channels. Water level instruments-Specification for the installation and performance of pressure actuated liquid level measuring equipment
standard by BSI Group, 07/30/1971

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BS

PDF Standards BS 1121-19:1951

Methods for the analysis of iron and steel. Small amounts of soluble silicon in plain carbon and low alloy steels and irons (Absorptiometric method)
standard by BSI Group, 03/30/1951

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