The invention is directed to circuitry for reproducing the data on a magnetic stripe recorded. A security access card is manually passed through a card-reading device at an uneven low velocity, storing the data in one half cycle of operation in uniform number of data storage cells despite the unevenness...http://www.google.fr/patents/US4486653?utm_source=gb-gplus-shareBrevet US4486653 - Adaptive rate card data reproducing and storing apparatus
Adaptive rate card data reproducing and storing apparatus
