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United States Utility Patents
4,821,320 - 4,821,329

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NumberTitle
4,821,320 Device for protecting electrical apparatus and the operator when the operator carries a high electrostatic charge
4,821,321 Automatic secure transmission and reception of pictorial information
4,821,322 FM multiplex decoding
4,821,323 Stereo headphone
4,821,324 Low bit-rate pattern encoding and decoding capable of reducing an information transmission rate
4,821,325 Endpoint detector
4,821,326 Non-audible speech generation method and apparatus
4,821,327 Acoustical stethoscope with electrical filter
4,821,328 Sound reproducing system with Hall effect motional feedback
4,821,329 Audio switch device with timed insertion of substitute signal



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