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PDF Standards BS 3939-9:1985

Graphical symbols for electrical power, telecommunications and electronics diagrams-Telecommunications: switching and peripheral equipment
standard by BSI Group, 06/28/1985

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PDF Standards BS 2000-272:1993

Methods of test for petroleum and its products-Determination of mercaptan sulfur and hydrogen sulfide content of LPG. Electrometric titration method
standard by BSI Group, 02/28/1993

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