Signal for lunch at the factory:
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Automatic telephone switch
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Air compressor, air blow
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Electric generator (hum)
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Signal for lunch at the factory
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Air compressor turn on, turn off
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Letter press
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Grind wood with a grinder, noise in
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Working machine engine
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Robotic assembly line
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Oil pump
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Hydraulic pump
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Welding transformer operation under load
★★★★★
