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High shear strength pultrusion
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Patent number 5,795,424
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Issue date Aug 18, 1998
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Ebert Composites Corporation
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David W. Johnson
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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High shear strength pultrusion
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Patent number 5,597,629
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Issue date Jan 28, 1997
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Ebert Composites Corporation
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David W. Johnson
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Joint for truss structure
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Patent number 5,310,273
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Issue date May 10, 1994
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Yamaha Hatsudoki Kabushiki Kaisha
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Yukio Hara
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Pole structure
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Patent number 5,222,344
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Issue date Jun 29, 1993
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David W. Johnson
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Interlocking support structures
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Patent number 5,024,036
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Issue date Jun 18, 1991
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David W. Johnson
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Support stand
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Patent number 4,991,726
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Issue date Feb 12, 1991
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David W. Johnson
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3229004
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Patent number 3,229,004
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Issue date Jan 11, 1966
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B28 - WORKING CEMENT, CLAY, OR STONE