| 摘要 |
PCT No. PCT/FR85/00167 Sec. 371 Date Feb. 25, 1986 Sec. 102(e) Date Feb. 25, 1986 PCT Filed Jun. 24, 1985 PCT Pub. No. WO86/00193 PCT Pub. Date Jan. 16, 1986.The invention concerns a procedure for undermining underwater terrain (S) thus creating an upward rising current (Tj) able to lift items lying on the terrain (S) or half-buried in it, in order to collect them in a recovery net. The invention also covers devices to be used for harrowing and cleaning shell-fish beds or for dredge-fishing shell-fish. |
