| 摘要 |
This blade is noteworthy in that it comprises a circular body (6) (9) capable of receiving at least one cutter (5) located radially overhanging the said body, the said cutter or cutters (5) being mounted in combination with arrangements of the body so as automatically to be, on the one hand, retracted upon encountering a hard non-cuttable object and, on the other hand, returned to the working position under the effect of centrifugal force. <IMAGE>
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