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swpt_SZHQ0FTp  
#1 Posted : Friday, March 12, 2021 11:23:47 PM(UTC)
swpt_SZHQ0FTp

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Joined: 8/27/2020(UTC)
Posts: 33

DTH drilling is the main method of drilling today. The hole is straight and clean; smooth and level walls, easy to carry explosives; the ability to drill deep holes and transmit energy efficiently is advantages that make other drilling techniques ineffective. https://www.speedmadedrill.com/d...le-drilling-hammers.html
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