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Electrochromic matrix display
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Patent number 4,644,344
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Issue date Feb 17, 1987
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International Business Machines Corporation
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Thor A. Larsen
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Electrochromic display device
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Patent number 4,252,418
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Issue date Feb 24, 1981
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International Business Machines Corporation
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Donald J. Barclay
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G02 - OPTICS
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Electrochromic display device
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Patent number 4,228,431
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Issue date Oct 14, 1980
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International Business Machines Corporation
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Donald J. Barclay
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Electrochromic display device
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Patent number 4,167,309
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Issue date Sep 11, 1979
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International Business Machines Corporation
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Donald J. Barclay
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G02 - OPTICS