Example image of eyePlorer eyePlorer map for 'Barcode': Machine-readable medium Barcode reader Image scanner Point of sale Supermarket Automatic identification and data capture Radio-frequency identification Bernard Silver Drexel University Philadelphia Norman Joseph Woodland Ultraviolet Morse code Incandescent light bulb Movie projector Photomultiplier Soundtrack Bullseye Patent application October 7 IBM Philco RCA Traffic collision Pennsylvania Railroad Railroad car Massachusetts Institute of Technology Sylvania Electric Products Boston and Maine Corporation Gravel Association of American Railroads Bankruptcy New Jersey Toll bridge United States Postal Service Retroreflector Whiskas Helium–neon laser Carlstadt, New Jersey General Motors Pontiac, Michigan Axle Kroger Litton Industries NCR Corporation Pitney Bowes Singing Troy, Ohio Juicy Fruit Smithsonian Institution