| 摘要 |
A plurality of sand fighter rotor units are attached to a folding tool bar upon a tractor. Each rotor unit operates in a furrow between rows of growing crops on top of the beds. Each rotor has four spiders with two distal spiders working on the side of the bed and two medial spiders working near the bottom of the furrow. The prongs of the medial spiders are longer than the prongs of the distal spiders. The prongs of the spiders are arranged to dig less than two divots per square foot.
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