000			00475nam a22001577a 4500
008			230613b |||||||| |||| 00| 0 eng d
040			_aNational Science Library _cNational Science Library
080			_a621.326.5 _bK4.2
245			_aNo. 1 electronic switching system
260			_aAmerica: _bAmerican Telephone and Telegraph Company, _c1964
300			_a2609p.
490			_aMonograph 4853
650			_aSwitching system
653			_aNetwork frames
942			_2udc _cBK
999			_c42765 _d42765