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3727214
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Patent number 3,727,214
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3656147
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Patent number 3,656,147
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Issue date Apr 11, 1972
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3636552
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Patent number 3,636,552
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3614768
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Patent number 3,614,768
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Issue date Oct 19, 1971
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3614765
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Patent number 3,614,765
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Issue date Oct 19, 1971
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G06 - COMPUTING CALCULATING COUNTING
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3588820
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Patent number 3,588,820
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Issue date Jun 28, 1971
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G06 - COMPUTING CALCULATING COUNTING
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3540033
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Patent number 3,540,033
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Issue date Nov 10, 1970
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3529155
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Patent number 3,529,155
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3495240
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Patent number 3,495,240
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Issue date Feb 10, 1970
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G06 - COMPUTING CALCULATING COUNTING
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3491354
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Patent number 3,491,354
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Issue date Jan 20, 1970
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G08 - SIGNALLING
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3479491
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Patent number 3,479,491
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Issue date Nov 18, 1969
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G06 - COMPUTING CALCULATING COUNTING
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3470556
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Patent number 3,470,556
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3460135
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Patent number 3,460,135
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3448444
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Patent number 3,448,444
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3445838
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3444552
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Patent number 3,444,552
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3441927
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Issue date Apr 29, 1969
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G08 - SIGNALLING
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3440642
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Patent number 3,440,642
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G06 - COMPUTING CALCULATING COUNTING
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3431833
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Patent number 3,431,833
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Issue date Mar 11, 1969
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3424897
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Patent number 3,424,897
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3418043
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Patent number 3,418,043
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3418635
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Patent number 3,418,635
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Issue date Dec 24, 1968
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS