@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_kelly_	skos:broader	isac:drill_string_ .
isac:_drill_	skos:broader	isac:drill_string_ .
isac:_extrapolation_	skos:broader	isac:drill_string_ .
isac:_embodiment_	skos:broader	isac:drill_string_ .
<http://webisa.webdatacommons.org/concept/_aspect_of+the+invention>	skos:broader	isac:drill_string_ .
isac:_casing_	skos:broader	isac:drill_string_ .
isac:drill_collar_	skos:broader	isac:drill_string_ .
isac:bottom_hole_	skos:broader	isac:drill_string_ .
isac:drill_pipe_	skos:broader	isac:drill_string_ .
<http://webisa.webdatacommons.org/concept/drill+pipe_section_>	skos:broader	isac:drill_string_ .