About: http://webisa.webdatacommons.org/219265445

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 gear boxes 30a and 30b, for example, may employ worm gears or other effectively one way mechanisms permitting easy drive but resisting gravity and other forces tending to move the core without drive.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com