Davis, Sidney A. Electromechanical components for servomechanisms / [by] Sidney A. Davis [and] Byron K. Ledgerwood. - New York : McGraw-Hill, 1961. - 338 p. : ill. ; 24 cm. Includes bibliography and index. Subjects--Topical Terms: Servomechanisms.Electromechanical devices. Dewey Class. No.: 629.83 / DAE