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title Roller bits
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http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/E21B10-16
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/E21B10-18
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/E21B10-083

Total number of triples: 284.