<http://webisa.webdatacommons.org/180378650>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/185867640>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/180378650> .
<http://webisa.webdatacommons.org/180378650>	<http://www.w3.org/ns/prov#value>	"The resonant frequency is defined by the acoustic resonance of the stack and is dependant upon parameters such as thickness, material, compression, temperature and friction." .
<http://webisa.webdatacommons.org/180378650>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<freepatentsonline.com> .