Electrical instruments, namely devices employing computer software for use in acquiring, analyzing and displaying rotating rotor and propeller blade track and balance data, from helicopter and fixed wing aircraft to determine blade out-of-track or unbalance

'acquir':11 'aircraft':29 'analyz':12 'balanc':22 'blade':19,32 'comput':6 'data':23 'determin':31 'devic':4 'display':14 'electr':1 'employ':5 'fix':27 'helicopt':25 'instrument':2 'name':3 'out-of-track':33 'propel':18 'rotat':15 'rotor':16 'softwar':7 'track':20,36 'unbal':38 'use':9 'wing':28

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