The front pulling section of a semitrailer. Also known as truck-tractor. McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc. tractor crawler tractor A powerful engine-driven vehicle, on wheels or on tracks, used for pushing or pu...
chip-based optical trap that acts as a “tractor beam” for studying DNA, classifying cells and investigating disease mechanisms. The device – which is small enough to fit in your hand – is made from
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