| 摘要 |
A cutting device (10) comprises a main frame (12) which supports a pair of front wheels (14) and a pair of rear wheels (16), and a sub-frame (60) which is pivotably mounted relative to the main frame about an axis coincident with that of the wheels (16). Cutting blades (34, 36) are mounted on the sub-frame and are arranged to be driven by an engine (38) such that, at their cutting positions, they are driven in the same direction as the direction of forward movement of the device in order to form a parallel sided trench.
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