| http://www.w3.org/ns/prov#value | - vending machine and its associated data conditioner shift register; FIG. 3 is a functional block diagram of the data concentrator, in which the machine data is compared and stored; FIG. 4 is a functional block diagram of the rest of the system following the data concentrator, including the communication link and central processing unit and its recording and display accessories; FIG. 5 is a schema
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