Milling machine:
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Automatic telephone switch
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Low frequency running engine
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Postal sorting line
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Power station turbine
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Milling machine
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Heidelberian sorting printer
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Air blow, Air compressor
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Box making machine
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Car factory, hammer knocking, welding
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Stop, Lathe turning on, work
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Room noise, Glass bottles on a conveyor line
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Canning machine
★★★★★