Conveyor, conveyor belt:
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Signal for lunch at the factory
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Spectrograph
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Room noise, Glass bottles on a conveyor line
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Forklift truck moving away
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Canning machine
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Forklift, off, on, standby
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Notches, print imprinted in cardboard
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Steam pump
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Conveyor, conveyor belt
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Milling machine
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Compressor, run, shutdown, start
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Work in a warehouse, loaders, general noise
★★★★★