A combined bill acceptor and smart card reader (or other data unit reader) comprises a bill acceptor, a host interface, and a smart card reader interposed between the bill acceptor and the host interface. The smart card reader preferably permits unimpeded pass-through of cash transaction data from the...http://www.google.de/patents/US7152783?utm_source=gb-gplus-sharePatent US7152783 - Combined card reader and bill acceptor
