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GB 7231-2003 English PDF (GB7231-2003)

GB 7231-2003 English PDF (GB7231-2003)

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GB 7231-2003: Basic identification colors and code indications and safety sign for industrial pipelines
This standard specifies the basic identification color, code indications and safety signs for industrial pipelines. This standard applies to gas and liquid pipelines that are not buried underground in industrial production.

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