| 摘要 |
The tool has a lower end (11) that slides in a tubular part of an intermediate cylindrical unit (13) compressing a spring abutting against a tension adjustment unit and overlaps it to produce a force by a movement indicator (34). The cylindrical unit slides in an upper tube (15) compressing another spring abutting against another adjustment unit and overlaps it to produce another force by another indicator (36). |
