Converter
Counter means
Credit card carriers and methods of manufacture
Credit card containing electronic circuit
Credit card reader having two magnetic readout heads
Credit card verifier
Credit card verifier
Credit verification system
Credit verification terminal with dual information sources
Curve reading method and apparatus
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