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Extendable and contractible flexible joint
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Patent number 10,088,085
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Issue date Oct 2, 2018
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Waterworks Technology Development Organization Co., Ltd.
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Kikuo Saito
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Pipe joint construction
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Patent number 7,604,263
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Issue date Oct 20, 2009
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Tokyo Metropolitan Government
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Mitsuhiro Mori
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Sluicing valve device
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Patent number 7,073,776
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Issue date Jul 11, 2006
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Waterworks Technology Development Organization Co., Ltd.
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Mitsuhiro Mori
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