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US2680146A
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Birefringent filter for color television
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Supersonic light modulator
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CA686138A
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Metering systems especially useful for subscription television
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CA752973A
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Television secrecy system
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CA686139A
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Metering systems especially useful for subscription television
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CA782707A
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Scrambled television system
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CA778518A
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Interrogated transponder system
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CA629128A
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Coding methods and apparatus useful in scrambled television
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CA518838A
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Supersonic light modulator
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CA510022A
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Color television receiving apparatus
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CA515293A
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Production of images in color
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CA477321A
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Methods and discharge devices for producing electric oscillations
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CA641140A
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Scrambled television transmission
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CA688740A
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Character generation
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CA686136A
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Metering systems especially useful for subscription television
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CA703304A
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Metering systems especially useful for subscription television
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CA742363A
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Interrogated transponder system
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CA719346A
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Metering systems especially useful for subscription television
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CA527671A
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Color television
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CA686137A
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Metering systems especially useful for subscription television
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