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The Reason Behind Those Brightly Colored Balls Along Power Lines | Mental Floss
Aerial Marker Balls for Power Lines Model JX - Flight Light Inc.
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What Are Those Colorful Balls That Are Attached To Power Lines? » Science ABC
What Are Those Big Colorful Balls You See On Powerlines? | IFLScience
Aerial Marker Balls for Power Lines Model JX - Flight Light Inc.
Aerial Marker Balls for Power Lines Model JX - Flight Light Inc.
What are the Colored Aerial Marker Balls on Power Lines For?