Spinning machine:
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Electric welding
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Automatic telephone switch
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Box making machine
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Electric industrial motor
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Robotic assembly line
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Low frequency running engine
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Spectrograph
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Welding transformer, working,, turning on
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Machine engine gaining momentum
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Forklift drives by
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Grind metal on a grinding machine in a
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Loaders, Work in a warehouse, general noise
★★★★★