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Mandrel means
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Patent number 5,192,390
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Issue date Mar 9, 1993
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Bridgestone/Firestone Inc.
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David J. B. Perkins
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Plastic pipe
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Patent number 4,998,563
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Issue date Mar 12, 1991
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UC Industry Co., Ltd.
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Akio Nagayoshi
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Dual wire hose
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Patent number 4,224,463
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Issue date Sep 23, 1980
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Automation Industries, Inc.
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Marvin A. Koerber
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Continuously advancing mandrel
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Patent number 4,213,811
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Issue date Jul 22, 1980
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Automation Industries, Inc.
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Marcus A. Hall
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Production of reinforced plastic pipes
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Patent number 4,200,605
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Issue date Apr 29, 1980
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Sekisui Kagaku Kogyo Kabushiki Kaisha
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Tetuo Imamura
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3903575
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Patent number 3,903,575
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Issue date Sep 9, 1975
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3886016
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Patent number 3,886,016
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Issue date May 27, 1975
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL