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#black propeller #mechanical propeller #spinning mechanism #rotor #propulsion device #black rotor

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#black propeller #black fan #fan blades #impeller #black impeller #ventilation part #cooling fan

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#black propeller #boat propeller #marine propeller #outboard motor #black boat part #maritime propulsion

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#black propeller #propeller symbol #dark propulsion #engine symbol #rotational mark #schematic symbol