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Seamark Technologies: Buoys and Beacons

What are the TWO main functions of a lighthouse tower? πŸ πŸ”¦
Difficulty: Easy
πŸ€” According to the text, which shapes are UNIFORMLY used to describe buoys? πŸŸ’πŸ”ΆοΈ
Difficulty: Medium
🀯 According to their purpose, what type of light does sectors primarily utilize, and which COLOR is most frequently employed? 🌈
Difficulty: Hard
Space: Our Seamarks By E. Price Edwards 1884

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