Spectrograph:
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Notches, print imprinted in cardboard
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Canning machine
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Forklift truck moving away
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Hydraulic down machine
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Low frequency running engine
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Box making machine
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Grind metal on a grinding machine in a
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Factory Atmosphere
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Forklift approaching
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Factory atmosphere, drone in a mine tunnel
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Working machine engine
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Hydraulic pump
★★★★★