Lgz Landis Gyr Zug Ag

Joseph A Clarinval

David L Greenaway

Alex Nyfeler

Rolf Schmidhauser

Device for the thermal erasure of mechanically readable optical markings

Apparatus for storing and reading data in association with a card which has a timing track comprising at least three different kinds of optically-readable timing markings arranged in the timing track in a cyclic sequence, and a data track, the apparatus including three optical timing sensors respectively responsive to the three different kinds of timing markings, and a reading direction detector controlled by the timing sensors.

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Rotkreuz, Switzerland

Joseph A Clarinval