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United States Utility Patents
4,924,450 - 4,924,459

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NumberTitle
4,924,450 Ultrasonic ranging and data telemetry system
4,924,451 Computer time clock
4,924,452 Watch provided with a dial
4,924,453 Watch having a glass retaining strap
4,924,454 Servo apparatus with offset compensation
4,924,455 Apparatus for generating tracking error signals in a differential phase detection system
4,924,456 High speed modem
4,924,457 Concentrator system with polling-response means for detecting failures to stop tariff charges on locally established intraoffice calls
4,924,458 Multiplex communication system
4,924,459 Digital transmission interconnect signal



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