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Double piping structure
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Patent number 5,224,738
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Issue date Jul 6, 1993
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Jun Taga
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Multilayer pipe joint
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Patent number 4,400,019
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Issue date Aug 23, 1983
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Unisert Systems, Inc.
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Benant E. Fruck
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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3248134
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Issue date Apr 26, 1966
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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