PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • No. 821,580 2 Claims. (Cl. 50-192) This invention relates to roof covering in the form of shingles, strips, or sheets and more particularly to such covering having heat reflective and heat absorbent areas.
http://www.w3.org/ns/prov#wasQuotedFrom
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