| 摘要 |
A retractable cover including a flexible material portion; and incorporated therewith at least one biasing means (1, 3) being biased from an extended position towards a retracted rolled-up position, the biasing means (1, 3) being adapted in the said extended position to be attachable along the flexible material portion, charaterised in that the flexible material portion with the incorporated biasing means (1, 3) is rolled up as the biasing means (1, 3) moves towards a retracted position.
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