| 摘要 |
Apparatus for cutting vegetation with a rotatable head carrying a non-metallic cutting line extended into a cutting plane. A supply line coil is carried within the head. A mechanism in the head automatically feeds replacement line from the coil to constantly maintain a predetermined maximum length in the cutting plane. The cutting line length is extended immediately when any length of cutting line is lost to wear or breakage. The line-feeder mechanism feeds replacement cutting line at a rate proportional to the length of replacement cutting line.
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