
Devices to prevent pollution by backflow of potable water - Air gap with non-circular overflow (unrestricted) - Family A - Type B
出版:German Institute for Standardisation (Deutsches Institut für Normung)

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Devices to prevent pollution by backflow of potable water - Air gap with non-circular overflow (unrestricted) - Family A - Type B
出版:German Institute for Standardisation (Deutsches Institut für Normung)
专家解读视频