Data exchange system

Data handler for handling data having multiple data formats

Data highway access control system

Data input controller for inhibiting and enabling input

Data input device for IC-key lock system

Data medium for identifying objects, scanning device for interro

Data network acknowledgement arrangement

Data network employing a single transmission bus for overlapping

Data networks

Data processing arrays and a method of producing them

Data processing device and method for use in a paging receiver

Data processing network

Data processor

Data reporting system

Data selection matrix

Data setting system for terminal units in remote supervisory and

Data signalling system

Data signalling system

Data switching device

Data switching processing method and apparatus