<http://webisa.webdatacommons.org/prov/122765781>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/288960877> .
<http://webisa.webdatacommons.org/288960877>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/288960877>	<http://www.w3.org/ns/prov#value>	"Preferably, the top and bottom surfaces of the piezoelectric disk 162 may be provided with a thin conductive coating of any suitable metal, such as nickel, to make it more convenient to electrically excite the piezoelectric disk 162." .
<http://webisa.webdatacommons.org/288960877>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .