Air compressor turn on, turn off:
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Standby, Forklift, on, off
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Work, start, jamming, Generator
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Small centrifuge
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Gas welding
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Power station generator
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Factory atmosphere, drone in a mine tunnel
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Machine engine gaining momentum
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Hydraulic down machine
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Box making machine
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Signal for lunch at the factory
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Working,, turning on, Welding transformer
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Circular knitting machine
★★★★★