Borehole Drilling Method

rotary hammer drilling

http://resource.geosciml.org/classifier/cgi/boreholedrillingmethod/rotary_hammer_drilling

notation 2.3 more like this
definition A percussion drilling method using a cutting tool powered by compressed air that creates a rapid percussion effect coupled with rotary action to drill hard rocks. more like this
source This vocabulary more like this
type
Resource
Concept
broader percussion drilling
narrower rotary hammer drilling
in scheme boreholedrillingmethod
is primary topic of rotary hammer drilling