Knocking a hammer indoors with an echo:
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Waits, Bobcat Loader Starts Up
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Diesel engine
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Construction of the road, clean the old
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Concrete processing, Construction
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Remove drill, Drill, insert
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Excavator starts up, expects to be jammed
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Expects to be jammed, Bulldozer starts
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Jamming, Excavator approaching
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Wood lathe
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Circular Saw Blade Closing
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Grinder
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Electric disc grinder
★★★★★