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What are those colourful Aerial marker balls on power lines?
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What are the Colored Aerial Marker Balls on Power Lines For?
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Overhead wire marker - Wikipedia
KETRACO on Twitter: "Ever wondered what are the balls that hang on power lines? They are called visibility marker balls. You'll often find them near mountain passes, in the deep valley areas,
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Aerial Marker Balls for Power Lines Model JX - Flight Light Inc.
