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Surface Hole Drill Bit
Tri-cone drill bits used to drill softer rock near the surface are large and heavy enough to require a fork lift.
Images ID: 20110720_BriBak_7678
Author: Jim Blecha
© 2011 Jim Blecha ALL RIGHTS RESERVED
Images size: 21.0 Mpixels (60.2 MB uncompressed) - 3744x5616 pixels (12.5x18.7 in / 31.7x47.5 cm at 300 ppi)
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