This HTML5 document contains 6 embedded RDF statements represented using HTML+Microdata notation.

The embedded RDF content will be recognized by any processor of HTML5 Microdata.

PrefixNamespace IRI
n5google.com.
isaphttp://webisa.webdatacommons.org/prov/
isahttp://webisa.webdatacommons.org/
rdfhttp://www.w3.org/1999/02/22-rdf-syntax-ns#
provhttp://www.w3.org/ns/prov#
xsdhhttp://www.w3.org/2001/XMLSchema#
Subject Item
isa:108478146
rdf:type
prov:Entity
prov:value
However, drilling through the previous drill bit in order to advance may be difficult as drill bits are required to remove rock from formations and, accordingly, often include very drilling resistant, robust structures typically manufactured from materials such as tungsten carbide, polycrystalline diamond, or steel.
prov:wasQuotedFrom
n5:au
Subject Item
isap:47681406
prov:wasDerivedFrom
isa:108478146
Subject Item
isap:44787959
prov:wasDerivedFrom
isa:108478146
Subject Item
isap:294561050
prov:wasDerivedFrom
isa:108478146