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Billboard large screen TV
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Patent number 4,368,485
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Issue date Jan 11, 1983
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Zenith Radio Corporation
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Richard W. Midland
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Electron gun control system
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Patent number 4,126,814
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Issue date Nov 21, 1978
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RCA Corporation
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Frank J. Marlowe
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3930120
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Patent number 3,930,120
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Issue date Dec 30, 1975
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3909525
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Patent number 3,909,525
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Issue date Sep 30, 1975
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G02 - OPTICS
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3758714
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Patent number 3,758,714
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Issue date Sep 11, 1973
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2219149
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Patent number 2,219,149
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Issue date Oct 22, 1940
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H04 - ELECTRIC COMMUNICATION TECHNIQUE