Aeronautic instrument that measures R.P.M. (unidentified3).jpg
National Institute of Standards and Technology
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Aeronautic instrument that measures R.P.M. (unidentified3), Aeronautic instrument that measures R.P.M.
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Aeronautic instrument that measures R.P.M. (unidentified3), Aeronautical measurement, Aerospace engineering, National Bureau of Standards
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R.P.M.を測る航空計器
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R.P.M.を測定した航空計器
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aeronautical engineering aeronautical engineer aerospace engineering rocket scientist office instrument aerospace engineer aeronautics aeronautical revolutions per minute