About: http://webisa.webdatacommons.org/295981036

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Also , hulls that are very thick or are double layered , or made from materials such as wood or metal , ( which do not conduct sonar signals ) make inside the hull mounting inadvisable .
http://www.w3.org/ns/prov#wasQuotedFrom	hammerwall.com