1:26
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Helicopter hovering and moving away slowly
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0:59
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Two helicopters hovering constantly with some birds
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2:51
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Two helicopters hovering constantly with some birds and jets passing
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2:25
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Two helicopters hovering away slowly with a few birds
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2:49
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Helicopter hovering constantly in the distance
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0:58
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Two helicopters hovering close and distant
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4:55
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Two helicopters hovering and wandering in the distance with a bird
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3:28
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Helicopter hovering constantly in the medium distance
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0:19
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Multiple helicopters hovering overhead
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0:29
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Rapid sequence of smooth multi tonal pulses
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