Obstetrics measure and calculator
Off-line cash dispenser and banking system
Off-line magnetic card reader system operable as though normally
On-line verification system for identification card or the like
Operating system authenticator
Optical bar code reader
Optical code readers
Optical identification system and reader for reading optical gra
Optical indicia marking and detection system
Optical reader fluorescence control
Optical reading apparatus and method
Optical system for code symbol scanners
Optically readable two-dimensional code and method and apparatus
Overlap distance indicating device