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United States Utility Patents
5,249,170 - 5,249,179

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NumberTitle
5,249,170 Memory disk and apparatus for recording information on memory disk
5,249,171 Opto-magnetic pick-up device including phase difference correcting means
5,249,172 Write laser power setting responsive to a series of written test signals having two frequency components
5,249,173 Galvanomirror unit
5,249,174 Time-division communication method for mobile bodies and system using said method
5,249,175 Optical information recording medium and information recording and reproducing method therefor
5,249,176 Optical recording medium, process for preparing the same and its optical recording and reproducing system
5,249,177 Structure for preventing dislocation of a spring in an optical disk cartridge
5,249,178 Routing system capable of effectively processing routing information
5,249,179 Echo canceller system suitable for a 2B1Q transmission code



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