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PDF Standards BS 2690-9:1970

Methods of testing water used in industry-Appearance (colour and turbidity), odour, suspended and dissolved solids, and electrical conductivity
standard by BSI Group, 11/01/1975

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PDF Standards BS 3600:1973

Specification for dimensions and masses per unit length of welded and seamless steel pipes and tubes for pressure purposes Metric units
standard by BSI Group, 01/31/1975

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