Recollections of the early development of servomechanisms and control systems

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[5]  C. R. Hanna,et al.  Electrical engineering: Gyroscopic stabilizer for tank guns , 1944, Electrical Engineering.

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[7]  G. D. McCann,et al.  Electrical Analogy Methods Applied to Servomechanism Problems , 1946, Transactions of the American Institute of Electrical Engineers.