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Wikipedia definition
1. Cog (ship)A cog (or cog-built vessels) is a type of ship that first appeared in the 10th century, and was widely used from around the 12th century on. Cogs were generally built of oak, which was an abundant timber in the Baltic region of Prussia. This vessel was fitted with a single mast and a square-rigged single sail. These vessels were mostly associated with seagoing trade in medieval Europe, especially the Hanseatic League, particularly in the Baltic Sea region.
Read “Cog (ship)” on English Wikipedia
Read “コグ船” on Japanese Wikipedia
Read “Cog (ship)” on DBpedia

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