000 00250nam a2200085 4500
080 _a621.394
_bLEH.69
245 _aIntroduction to telegraph engineering (translated from the German)
100 _aLehnert, Josef
260 _aBerlin
_bSiemens Aktiengesellschaft
_c1969
300 _a155p
999 _c30834
_d30834