In an IC memory card, sub-modules, in each of which a plurality of memory ICs are mounted on each of two opposed surfaces of a sub-substrate, are mounted on each of two opposed surfaces of a single substrate. Since the number of substrates connected to a connector is one, soldering of the connector is...http://www.google.es/patents/US5394300?utm_source=gb-gplus-sharePatente US5394300 - Thin multilayered IC memory card
