000 00239 a2200073 4500
245 0 _aCCITT Signalling System No.6 :
_bTest Schedule /
_c.
710 2 _aInternational Telecommunication Union.
_eWydawca
_4pbl
260 _aGeneva :
_bITU,
_c1982.
300 _a245 s.;
_c30 cm.
999 _c13912
_d13912