| 摘要 |
The tool comprises a roughly triangular plate forming a main body (10). A straight first edge (2) runs for the full length of the first side (10a) of the body, joining at the end via a radius (3) onto the second edge (4) at an acute angle (alpha). The second and generally straight edge has at its other end a concave-curved portion forming a recess (5), and by which it joins onto a third and straight edge (7). The latter leads to a fourth and curved edge (9), joined by a radius (12) at the other end onto the first edge. |
