<http://webisa.webdatacommons.org/prov/457279908>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/414807928> .
<http://webisa.webdatacommons.org/414807928>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<wantoday.com> .
<http://webisa.webdatacommons.org/414807928>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/414807928>	<http://www.w3.org/ns/prov#value>	"a jack-down system, with the roof section of the building gradually lowered while being supported by jacks and an internal crane moving debris and other materials down to the ground floor." .