Matches in DBpedia 2014 for { ?s ?p The Mackerel-class submarines were a pair of experimental prototype submarines built just prior to World War II. The two submarines were similar in size and capability to the S-class submarines built at the end of World War I, and had been ordered to test the feasibility of using mass production techniques to build submarines.. }
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- Mackerel-class_submarine comment "The Mackerel-class submarines were a pair of experimental prototype submarines built just prior to World War II. The two submarines were similar in size and capability to the S-class submarines built at the end of World War I, and had been ordered to test the feasibility of using mass production techniques to build submarines.".