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United States Utility Patents
5,208,850 - 5,208,859

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NumberTitle
5,208,850 Multi-media information service center and multi-media communication system
5,208,851 Method for controlling allocation of a communication link
5,208,852 Sound generation circuit
5,208,853 Method and apparatus for usage protection of data files using split key and unique variable
5,208,854 Picture carrier controlled automatic gain control circuit for cable television interdiction or jamming apparatus
5,208,855 Method and apparatus for irrigation control using evapotranspiration
5,208,856 Scrambling and unscrambling method for composite video signals and implementing device
5,208,857 Method and device for scrambling-unscrambling digital image data
5,208,858 Method for allocating useful data to a specific originator
5,208,859 Method for rekeying secure communication units by group



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