000			003040000a22001330004500
245			_aElectrical communication
100			_aAlbert, Arthur L.
250			_a3rd ed.
260			_aNew York _bJohn Wiley _c1950
300			_aix, 592p. : ill.
080			_a621.391 _bA4
041			_aEN
942			_cBK
999			_c103177 _d103177