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HANCOCK N. N. / CLAYTON, . (1990). THE PERFORMANCE AND DESIGN OF DIRECT CURRENT MACHINES. NULL: C.B.S.
HANCOCK N. N. / CLAYTON, . 1990. THE PERFORMANCE AND DESIGN OF DIRECT CURRENT MACHINES. NULL: C.B.S.
HANCOCK N. N. / CLAYTON, . THE PERFORMANCE AND DESIGN OF DIRECT CURRENT MACHINES. NULL: C.B.S. 1990.