Some of the many torpedoed ships now on the bottom of the sea may be raised and put to work again through ithe invention of Charles O. Knudsen of Brooklyn, an American paper states. It consists of a floating dry dock, with its hollow walls sectioned for buoyancy. It can be sunk by admitting water, re-floated by pumping in air Two such docks, one under either end of a sunken vessel, could raise her, the inventor claims, and then carry her to harbour for permanent repairs.
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https://paperspast.natlib.govt.nz/newspapers/WAITA19420925.2.62.2
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Wairarapa Times-Age, 25 September 1942, Page 4
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86Page 4 Advertisements Column 2 Wairarapa Times-Age, 25 September 1942, Page 4
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