Interlocking system with a number of individual key elements

Inventory taking system for an automatic warehouse

Jacquard card to magnetic tape archives storage and retrieval sy

Labels and label readers

Laser beam label reader head

Logarithmically normalized cross-correlation bar-code reader

Machine readable merchandise marking tag

Magnetic card substitute for coins for starting appliances and t

Magnetic card writing and reading device

Magnetic data reader employing magnetically operated solid state

Magnetic identification apparatus

Magnetic reader for bar encoded characters

Magnetic-type information card and method and apparatus for enco

Manually operable card reader

Mark reader with improved mark sensing heads

Marking document and template assembly and method of making the

Mechanical computer assembly

Mechanical fuel pump computer conversion mechanism

Mechanical fuel pump computer conversion mechanism

Memory fullness indicator