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Wheelock strobe at Rosslyn Center
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Fire alarm at Wheaton Plaza
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Horizontal traffic light in use as a blinker [04]
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Horizontal traffic light in use as a blinker [03]
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Horizontal traffic light in use as a blinker [01]
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Horizontal traffic light in use as a blinker [02]
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Microwave communications antenna in Colonial Heights, Virginia [01]
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Microwave communications antenna in Colonial Heights, Virginia [02]
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Active fire alarm at Hotel 24 South