A down-the-hole drill, usually called DTH by most professionals, is basically a screwed on the bottom of a . The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or ). The DTH hammer is one of the fastest ways to drill hard rock. The system is thought to have been invented independently by Stenuic. [pdf]
The term spot trade refers to the purchase or sale of a foreign currency, financial instrument, or commodity for instant delivery on a specified spot date. Most spot contracts include the physical deliveryof the curr. [pdf]
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