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Sign system
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Patent number 6,308,446
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Issue date Oct 30, 2001
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Visual Graphic Systems Inc.
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Donall B. Healy
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Sign system
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Patent number 6,298,591
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Issue date Oct 9, 2001
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Visual Graphic Systems Inc.
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Donall B. Healy
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Modular signage system
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Patent number 5,555,660
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Issue date Sep 17, 1996
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Roger Whitehouse
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Modular signage system
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Patent number 5,428,914
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Issue date Jul 4, 1995
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Roger Whitehouse
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS