@mstewartjr tweets related to: Hole, Dth, Advancement, Systems

Steel driven piles have been around since the early 1900s and continue to be used effectively. With steel piling, one uses HP steel shapes. HP is so named because, looking at the end of the steel shape, it is in the form of the letter H. P stands for pilings, hence the HP.
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Down the Hole (DTH) hammer and casing advancement systems: http://t.co/t9x7UREePM

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