Oil pump:
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Spinning machine
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Laser welding
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Box making machine
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Circular knitting machine
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Air compressor turn on, turn off
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Signal for lunch at the factory
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Notches, print imprinted in cardboard
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Welding transformer, working,, turning on
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Factory work, general noise
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Forklift, standby, on, off
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Industrial exhaust fan
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Printing press
★★★★★