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<http://webisa.webdatacommons.org/prov/345805925>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/154979367> .
<http://webisa.webdatacommons.org/154979367>	<http://www.w3.org/ns/prov#value>	"The following U.S. patents, all assigned to the assignee of the present invention, provide examples of the types of approaches that can be used to implement the transmitter 12: U.S. Pat. Nos. 4,550,607; 4,699,009; 5,148,810; 5,608,690; 5,675,554." .