THE HISTORY OF DOWN-THE-HOLE DRILLING AND THE
3. GENERAL BACKGROUND TO WATER-POWERED, DOWN-THE-HOLE HAMMER DRILLING (WDTH) WDTH’s are used in hard, stable rock drilling, and with casing systems for overburden drilling. Compared to conventional air driven down-the-hole hammers or top hammers, these WDTH’s provide many advantages, including low energy consumption,
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