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Original standard DVGW W 235-2 2016-10 in PDF full version. Additional info + preview on request

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Original standard DVGW W 235-3 2012-04 in PDF full version. Additional info + preview on request

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Original standard DVGW W 239 1991-07 in PDF full version. Additional info + preview on request

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Original standard DVGW W 239 2011-03 in PDF full version. Additional info + preview on request

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Original standard DVGW W 239 2021-10 in PDF full version. Additional info + preview on request

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Original standard DVGW W 239 E 2009-12 in PDF full version. Additional info + preview on request

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