About: http://webisa.webdatacommons.org/393897509

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	Previously, most of the products are made of cast iron,and the material is quite heavy and must be repainted every year to prevent rust.
http://www.w3.org/ns/prov#wasQuotedFrom	mynete.net