| 摘要 |
FIELD: fishery. ^ SUBSTANCE: troll includes base, which is metal element of streamlined form with holes and fender located at about 90° angle to base plane and troll longitudinal axis. Fender is made in the form of ellipse fragment so that maximum and minimum curvature radiuses are at opposite side of base. Ratio between fender thickness and base thickness is within 0.05 to 3. ^ EFFECT: high fish catching capability in different water basins. ^ 1 dwg
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