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US2009302071A1
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Multifunctional seal device for a valve for a drinking receptacle
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AU2003303118A1
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A valve device having two membranes for a drinking container
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A cover-removal indicator and a method for production of the indicator
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An opening-force-maximizing device of an underpressure-activated valve for a drinking container
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Method and valve device for a drinking container
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A valve device for a drinking container and a method for using the valve device
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