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A German standard of the German Institute for Standardization ( ) for manhole tops with vents, class B125 ( )

From the standard overview:
This standard applies in conjunction with DIN EN 124 ( ) and DIN 1229 ( ) for the summary of components for manhole tops of class B 125 with round or square frames for covering man entries and inspection chambers of drains and sewers.

Download document from Beuth Verlag (payment)

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