Data carrier for use in data processing apparatus
Data carrier optically readable by transmission and method of ma
Data collection system
Data control devices
Data processing system
Data reader
Data reading device
Data storage and retrieval system
Data transducer
Data-transfer system
Decoder clutching system for minicomputers
Desk-top calculator
Detection system for spatially-distributed set of radiation beam
Device for electroconductive connection and reading
Device for electroconductive connection and reading
Device for transmitting information in the form of electrical si
Dietary aid
Digital area navigation system and combined magnetic card reader
Digital rate compensator for a card reader
Dispensing system and security card for use therewith