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DK279385D0
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Water installation for disposal of waste water
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ZA8308636B
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Automatic air valve device for ducts
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BE895071A
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Automatic air valve device for pipes
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BE891095R
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Sanitary wastewater system with siphon
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ES8201668A3
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Hydraulic installation of evacuation of used waters (Machine-translation by Google Translate, not legally binding)
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ES480065A3
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Automatic valve device for sanitary discharge of used water. (Machine-translation by Google Translate, not legally binding)
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CH630981A5
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Automatic valve for sanitary sewage-discharging pipes and use of the automatic valve
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