D.C. reinsertion in video amplifier

Data buffer

Data communication system

Data communication system

Data communication system and bit-timing circuit

Data communication system using photocouplers

Data communications network testing system

Data communications system with improved asynchronous retiming c

Data communications system with improved digital phase-locked lo

Data compression

Data compression for pen stroke input

Data compression in digitizing tablet

Data entry system

Data indicator unit

Data input board

Data input control system

Data input device with a circuit responsive to stylus up/down po

Data input device with a pressure-sensitive input surface

Data modems having data drop-out and data echo protection

Data network interface module with circuitry for disconnecting a