000			002980000a22001330004500
245			_aPrivate electronic switching systems
110			_aIEE
260			_bIEE _c1978
440			_aIEE conference publication
440			_aNo. 163
080			_a621.3(063) _bI6
041			_aEN
942			_cBK
999			_c113503 _d113503