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Grid ceiling
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Patent number 4,665,674
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Issue date May 19, 1987
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Hunter Douglas International N.V.
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Johannes A. Brugman
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E04 - BUILDING
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Panel construction
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Patent number 4,272,937
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Issue date Jun 16, 1981
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Hunter Douglas International N.V.
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Johannes Antonius H. Brugman
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E04 - BUILDING
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Suspended screen ceiling
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Patent number 4,027,446
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Issue date Jun 7, 1977
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Hunter Douglas International N.V.
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Johannes Antonius Henricus Brugman
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E04 - BUILDING
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Screen ceiling
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Patent number 3,950,909
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Issue date Apr 20, 1976
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Hunter Douglas International N.V.
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Johannes Antonius Henricus Brugman
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E04 - BUILDING