Air-track drill

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A heavy drilling machine for quarry or opencast blasting. It has continuous tracks and is operated by independent air motors. It tows its rotary compressor and drills holes 3 in or 4 in (7.6 cm or 10.2 cm) in diameter at any angle, but it is chiefly used for vertical holes up to 80 ft (24.4 m) in depth. Nelson
Source: Dictionary of Mining, Mineral, and Related Terms

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