Low frequency rumble:
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Electrical discharge surge
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Tesla coil, Electric discharges
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Small electric motor
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Low Frequency Electric Drone
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Multichannel switch
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Toggle switch, Small switch
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Electric transformer
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Shutdown,, start up, Electronic energy
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Low frequency electric drone, movement
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Current, discharge, electricity
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Low frequency rumble
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Shoots an electric arc indoors
★★★★★