000 00227nam a2200073 4500
080 _a
_b
245 _aIEC: 663 - 1980; Planning of (single-sideband) power line carrier systems
700 _aInternational Electrotechnicl Commission
260 _aGeneva
_bIEC
_c1980
300 _a89p
999 _c35754
_d35754