| 摘要 |
PROBLEM TO BE SOLVED: To provide an undersea greening concrete block which can promote the overgrowth of sea weeds such as tangle. SOLUTION: This concrete block is characterized by forming projections 3 on the surface of a concrete block body 1 on which coarse aggregates are used to impart the water permeability and which has a pyramidal, conical or frustum portion 2. COPYRIGHT: (C)2004,JPO
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