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Decorative suspended ceiling
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Patent number 5,390,456
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Issue date Feb 21, 1995
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National Rolling Mills, Inc.
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William J. Platt
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B44 - DECORATIVE ARTS
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Decorative suspended ceiling
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Patent number 5,241,798
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Issue date Sep 7, 1993
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National Rolling Mills, Inc.
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William J. Platt
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B44 - DECORATIVE ARTS
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Compression leg
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Patent number 4,926,607
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Issue date May 22, 1990
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National Rolling Mills, Inc.
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William J. Platt
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E04 - BUILDING