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Mentioning concrete canoe recall film memories, where the legs of the victim are put info a concrete block to make her or him sink in the water. From here concrete canoe is quite far. It is not well-known, but J. L. Lambot made a ferro-concrete boat in 1848. And later there were freighters and warships made of ferro-concrete. One well-known example was USS Selma, which was made with 7500 tons net weight around 1919. But using concrete this way is usual today too, there are many ferro-concrete yachts.
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