Signal for lunch at the factory:
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Start, run, shutdown, Compressor
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Hydraulic down machine
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Room noise, Glass bottles on a conveyor line
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Car factory
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Spectrograph
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Machine engine gaining momentum
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Grind wood with a grinder, noise in
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Welding transformer operation under load
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Hydraulic pump
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Hydraulic activator
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Spinning machine
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Stitching machine
★★★★★