| 摘要 |
An improved anchor comprising a central longitudinal stem, or flat bar, two cylindrical bars arranged symmetrically near one end of the flat bar and in a transversal sense, two triangular-shaped flukes each with a tubular base for insertion on the cylidnrical bars, the axial displacement being limited by washers and pins, each fluke turning independently with an amplitude between the flukes of at least 120 DEG , the amplitude determined by the distance of two triangular tops from the central stem.
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