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

Method and an arrangement for reading coded information from a d

Method and apparatus for directing an observation member

Method and apparatus for interrupting a device for a preselected

Method and apparatus for tire identification

Method for identifying selected inventory items and reading the

Method of and apparatus for securing and storing personal inform