About: http://webisa.webdatacommons.org/110675290

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	The drilling fluid 8 may act directly on the pistons 40, or it may act indirectly through a power transmitting device from the drilling fluid 8 to an isolated working fluid such as an oil.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com