<http://webisa.webdatacommons.org/22019700>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<muellerinc.com> .
<http://webisa.webdatacommons.org/22019700>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/22019700>	<http://www.w3.org/ns/prov#value>	"They are equipped with springs, tracks, counter balancers, and other hardware which roll the sections into an overhead position, clear of the opening." .
<http://webisa.webdatacommons.org/prov/298669643>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/22019700> .