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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	If desired, a temperature sensitive device, such as a thermistor may be encased with the filters and photocells to provide a reading of the temperature at the depth of the unit.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com