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<http://webisa.webdatacommons.org/54180174>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/54180174>	<http://www.w3.org/ns/prov#value>	"In an alternative embodiment, a spring or other biasing mechanism can be attached to head 16 to urge it forward, regardless of the location of the center of gravity within the head." .
<http://webisa.webdatacommons.org/prov/423049535>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/54180174> .
<http://webisa.webdatacommons.org/prov/192800802>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/54180174> .