000 00260nam a2200073 4500
080 _a
_b
245 _aIEC: 617 - 7 - 1983; Graphical symbols for diagrams Part 7 switchgear, controlgear and protective devices
700 _aInternational Electrotechnical Commission
260 _aGeneva
_bIEC
_c1983
300 _a56p
999 _c30054
_d30054