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2. E.B. Canfield, Electromechanical Control Systems and Devices, Wiley, New York, 1965.
3. D.N. Keast, Measurements in Mechanical Dynamics, McGraw-Hill, New York, 1967.
4. F.T. Farago, Handbook of Dimensional Measurements, Industrial Press, New York, 1968.
5. E.E. Herceg, Handbook of Measurements and Control, Schaevitz Engineering, Camden, NJ, 1972.