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Turning on a radio then searching for a radio station
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Archeologist brush brushing sand
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Steam from an espresso machine, short blast
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Pet store fish tank running, loop
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An air drill working, constant whine
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Domestic kitchen fan exhaust, very close
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Checking tire pressure with tire gauge
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A low, steady and strong electrical buzz
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Hacksaw sawing wood very quickly
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Typing on a keyboard in a series 1