| http://www.w3.org/ns/prov#value | - for the message based on whether the message is explicit or global, and initiate retransmission of the message for reception by another radio frequency tag in response to a positive retransmit status for the message, the one or more receivers further comprising: a first receiver coupled to the antenna system to receive and demodulate messages from a first unit type at a first frequency; and a seco
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