| 摘要 |
This invention is a fastening device (4) for securing a cylindrical object in a ruler (1) or other measuring instrument. The fastening device (4) of the invention is inset in the ruler (1) and has an oval cross section with its largest width in the longitudinal direction of the ruler (1). This results in the least amount of possible ruler weakening and the greatest possible contact surface between the fastening device and the fastened object.<IMAGE> |
