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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	is difficult to be adopted readily. Further, when the photoelectronic sensor is used, there is a problem that such maintenance as cleaning a light projecting and receiving face periodically is required.
http://www.w3.org/ns/prov#wasQuotedFrom	docstoc.com