FIELD: shipbuilding. SUBSTANCE: patch has fabric envelope 1 made in form of cylinder whose ends are provided with rings 2 and 3 located over perimeter of the cylinder. Outlet ring 2 may be split or may be provided with two hinges located diametrically to facilitate forcing the patch overboard. Hold-down ring 3 of patch may be also provided with two hinges located diametrically to form two half-rings in stowed position, thus ensuring convenient stowage. EFFECT: enhanced reliability. 4 cl, 4 dwg
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