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Map projection system
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Patent number 5,024,523
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Issue date Jun 18, 1991
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Ambridge Limited
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Hans G. Jerie
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Position display instrument
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Patent number 4,525,717
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Issue date Jun 25, 1985
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Universitat Stuttgart, Institut Fur Flugnavigation
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Eberhard Wildermuth
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Map displays
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Patent number 3,945,720
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Issue date Mar 23, 1976
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Elliott Brothers (London) Limited
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Stafford Malcolm Ellis
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3474556
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Patent number 3,474,556
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Issue date Oct 28, 1969
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS