| 摘要 |
The invention concerns an economiser device for toilet tank comprising a plurality of stacked and ballasted base units (1), said base units (1) including a substantially prismatic hollow shape having, in operative position, an open top surface, the lateral surfaces of said base unit (1) comprising interlocking means (7, 8, 9) for co-operating to make said units (1) mutually integral, whereof the width and the length is a multiple of a modular value M.
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