| 摘要 |
An economical disc-shaped weight (28, 29; 35-37) is proposed which consists of a conventional structural steel or of another suitable material of standardised cross-section. The disc-shaped weights (28, 29; 35-37) have a helical winding (2, 3; 38-40) formed from a strip (5; 14-16) of approximately rectangular cross-section (11-13) and are sheathed in plastic. <IMAGE>
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