00387nam a2200145 4500 643 643 191108b ||||| |||| 00| 0 eng d 621.3132 B9351 149 Bull, Hempstead S. Direct-Current Machinery 4th ed. New York Wiley 1947 vi, 318 p. Electric Machinery ddc BK 0 0 ddc 0 621_313200000000000_B9351 0 2712 CL CL 1952-10-10 621.3132 B9351 00067 2019-11-08 1 BK