消波ブロック
別名:テトラポット(商標)
https://gyazo.com/3b10d8478a1d83710547bd382549178c
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https://gyazo.com/600b5bd2cf07bbd1f5b4fb589bce9465https://gyazo.com/328fc886ca28c3fc96e1111eeffceca3
https://gyazo.com/f383b2c1bbf0a1ee7dd84423480f4755
https://gyazo.com/67ff6921a06a55cfe1e68f47616c4c01https://gyazo.com/0d155ed112a2cfce681ee8efbcf5a964
https://gyazo.com/f3e22696970e5ec13033ce5ae1dae66d