LEADER 00964nam 2200325 450 001 996280665403316 005 20231206213959.0 010 $a1-5044-0282-0 035 $a(CKB)3710000000589811 035 $a(NjHacI)993710000000589811 035 $a(EXLCZ)993710000000589811 100 $a20231206d1969 uy 0 101 0 $aeng 135 $aur||||||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aIEEE No 305-1969 $eIEEE Guide for Protective Relay Applications of Audio Tones over Telephone Channels /$fInstitute of Electrical and Electronics Engineers 210 1$aNew York :$cIEEE,$d1969. 215 $a1 online resource (69 pages) 517 $aIEEE No 305-1969 606 $aTelephone 615 0$aTelephone. 676 $a621.385 801 0$bNjHacI 801 1$bNjHacl 906 $aDOCUMENT 912 $a996280665403316 996 $aIEEE No 305-1969$93646854 997 $aUNISA