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Composite stamp
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Patent number 5,423,573
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Issue date Jun 13, 1995
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Canada Post Corporation
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Georges de Passille
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3436854
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Patent number 3,436,854
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Issue date Apr 8, 1969
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3436954
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Patent number 3,436,954
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Issue date Apr 8, 1969
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3208771
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Patent number 3,208,771
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Issue date Sep 28, 1965
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS