Compressor, start, run, shutdown:
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Turn off, Air compressor turn on
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Car factory
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Noise in, Grind wood with a grinder
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Conveyor, conveyor belt
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Hammer knocking, Car factory, welding
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Off, standby, Forklift, on
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Gas welding
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Automatic telephone switch
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Signal for lunch at the factory
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Canning machine
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Circular knitting machine
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Forklift approaching
★★★★★