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Easily openable sealed package container
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Patent number 5,116,651
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Issue date May 26, 1992
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Toyo Seikan Kaisha, Ltd.
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Tadahiko Katsura
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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Easily-openable heat-seal lid
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Patent number 4,501,375
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Issue date Feb 26, 1985
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Toyo Seikan Kaisha, Ltd.
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Tadahiko Katsura
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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Easily-openable heat seal lid
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Patent number 4,428,494
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Issue date Jan 31, 1984
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Toyo Seikan Kaisha, Ltd.
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Kazumi Hirota
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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Easily-openable heat seal lid
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Patent number 4,403,710
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Issue date Sep 13, 1983
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Toyo Seikan Kaisha Ltd.
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Kazumi Hirota
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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