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Original standard DVGW W 239 E 2021-05 in PDF full version. Additional info + preview on request

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Original standard DVGW W 240 1987-12 in PDF full version. Additional info + preview on request

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Original standard DVGW W 249 2012-07 in PDF full version. Additional info + preview on request

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Original standard DVGW W 250 1985-08 in PDF full version. Additional info + preview on request

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Original standard DVGW W 251 1996-08 in PDF full version. Additional info + preview on request

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Original standard DVGW W 251 K 1996-10 in PDF full version. Additional info + preview on request

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