000 00251pam a2200109a 44500
082 _a621.3132
_bL26p6
100 _aLangsdorf, Alexander S.
245 1 _aPRINCIPLES OF DIRECT CURRENT MACHINES
260 _a
_b
_c
964 _gCIRC
997 _a4997 s C
999 _c415337
_d415337