Report - Percussion Drillingparsgp.com/edu/3_3.pdf · 2012-12-26 · 1 يا ﻪﺑﺮﺿ يرﺎﻔﺣ Percussion Drilling (shell & auger) ﺮﺧﺎﻓ ﻲﻠﻋ یرافح یاھ شور Auger

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