发明授权
US3667550A Lister-chisel combination 失效
LISTER-CHISEL组合

Lister-chisel combination
摘要:
A plurality of chisels are supported in spaced-apart locations along a laterally extending tool bar which is adapted to be moved forwardly over the ground level. Each chisel has a forwardly extending point at its lower end for penetrating the soil to form a narrow trench therein as the tool bar moves forwardly. A lister is mounted on each chisel to dispose its lower cutting edges in position to sever the soil above the lower end of the chisel point and turn it onto beds on opposite sides of the trench.
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