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Open perforated material
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Patent number 9,469,081
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Issue date Oct 18, 2016
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Contra Vision Ltd.
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George Roland Hill
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B44 - DECORATIVE ARTS
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Electroluminescent one-way vision panel
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Patent number 8,136,278
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Issue date Mar 20, 2012
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Contra Vision Limited
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George Roland Hill
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
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Partial printing of a substrate
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Patent number 6,552,820
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Issue date Apr 22, 2003
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Contra Vision Limited
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George R. Hill
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Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
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Partial printing of a substrate
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Patent number 6,210,776
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Issue date Apr 3, 2001
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Contra Vision Limited
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George R. Hill
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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Unidirectional panel
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Patent number 4,673,609
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Issue date Jun 16, 1987
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George R. Hill
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B44 - DECORATIVE ARTS