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Electric sign
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Patent number 4,724,630
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Issue date Feb 16, 1988
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Arden Williams
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G08 - SIGNALLING
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3456771
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Patent number 3,456,771
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Issue date Jul 22, 1969
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G07 - CHECKING-DEVICES
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2025151
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Patent number 2,025,151
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Issue date Dec 24, 1935
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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1961865
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Patent number 1,961,865
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Issue date Jun 5, 1934
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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1599167
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Patent number 1,599,167
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Issue date Sep 7, 1926
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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1528136
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Patent number 1,528,136
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Issue date Mar 3, 1925
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS