File:Tetrahedron wind direction indicator at the U.S. Naval Station Argentia, Newfoundland, circa in 1943 (80-G-K-14047).jpg
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![File:Tetrahedron wind direction indicator at the U.S. Naval Station Argentia, Newfoundland, circa in 1943 (80-G-K-14047).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/Tetrahedron_wind_direction_indicator_at_the_U.S._Naval_Station_Argentia%2C_Newfoundland%2C_circa_in_1943_%2880-G-K-14047%29.jpg/778px-Tetrahedron_wind_direction_indicator_at_the_U.S._Naval_Station_Argentia%2C_Newfoundland%2C_circa_in_1943_%2880-G-K-14047%29.jpg?20201216075607)
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