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Waterproof ceiling
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Patent number 8,156,702
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Issue date Apr 17, 2012
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Won Keol Kim
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E04 - BUILDING
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-
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False ceiling
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Patent number 4,354,863
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Issue date Oct 19, 1982
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Johann Oleszak
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E04 - BUILDING
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Under-roof drainage device
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Patent number 4,009,541
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Issue date Mar 1, 1977
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Yoshida Kogyo Kabushiki Kaisha
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Kiyoo Yoneya
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E04 - BUILDING
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3459115
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Patent number 3,459,115
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Issue date Aug 5, 1969
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B08 - CLEANING