| http://www.w3.org/ns/prov#value | - Counters constructed to operate in a manner similar to that described before with respect to the counters 142 and 158 are commercially available from such manufacturers as Texas Instruments, Inc. of Dallas, Texas, such as the type sold under the Texas Instruments, Inc. part number designation SN5493, for example, the counter 168 being constructed in a similar manner and also commercially available
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