About: http://webisa.webdatacommons.org/53767806

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	For example, a concrete wall is an obstruction that affects RF signals in the physical environment.Referring back to FIG. 1, in any case, the wireless element 102 may be a transceiver having both transmitter and receiver functionality.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com