| 摘要 |
Crossways-orientated to the first and second rails (51,52) are several components (8) supported on a base. The first and second rails are foxed to each other end to end by coupling devices (41,42). The components (8) supporting against an unprepared base (6') are formed at one end with a coupling device (8a). - The coupling device is suitable for a firm but easily removable cooperation with facing end parts of first two rails. The coupling device at the other end part functions similarly for two facing end parts of two other rails. |
