Notches, print imprinted in cardboard:
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Circular knitting machine
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Power station turbine
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Automatic telephone switch
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Welding transformer, working,, turning on
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Milling machine
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Hydraulic activator
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Welding transformer operation under load
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Crusher
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Room noise, Glass bottles on a conveyor line
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Electric welding
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Automatic folder
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Compressor industry
★★★★★