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  • with respect to the axis of the drill rod and for 2,956,783 Patented Oct. 18, 1960 preventing longitudinal movement of the covering tube, and Fig. 2 is likewise a view partly in central longitudinal section and partly in elevation showing the lower end of the drill rod and bit and covering tube in proper position to exclude dirt and other foreign matter from the interior thereof, and Fig. 3 is a t
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