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Looks like a pre Neolithic, 12th Century Albanian early NAFFI tea Ern, as used by old yin, and his cohorts, when they saw off the Mongol hordes, as they swept up from Lancashire, and over ran the haggis plantations, and deep fried mars bar orchards, just outside Glasgow. A good example can be found in the British museum, in the jockistan gallery.
Or it could be a deep sea bed radar scanning device, towed behind research vessels!
On a more thread-title-related note, and with no real sense of how big are these things, I believe I've seen similarly shaped devices being winched by crane to deliver concrete to high-rise bulding sites.