Electromechanical system theory / Herman E. Koenig and William A. Blackwell. Koenig, Herman E. (Herman Edward), 1924- Blackwell, William A. joint author. Automatic control. Systems engineering. Graphic methods. TJ213 .K58 629.8 KOE includes index. New York : McGraw-Hill, c1961. c1961. 1961 Text 504 p. : eng McGraw-Hill electrical and electronic engineering series.