000 002860000a22001330004500
245 _aPractical relay circuits
100 _aOliver, Frank J.
260 _aLondon
_bPitman
_c1973
300 _a363 p.
500 _adiagrams.
080 _a621.318.5
_bO6
041 _aEN
942 _cBK
999 _c94572
_d94572