Working machine engine:
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Turning on, working,, Welding transformer
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Automatic telephone switch
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Air compressor turn on, turn off
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Hydraulic machine up
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Book press
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Industrial exhaust fan
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Breakdown press
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Forklift in motion
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Forklift truck moving away
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The atmosphere of the factory, rattling
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Hydraulic down machine
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Brewing unit, fluid drilling
★★★★★