000			00410pam a2200145a 44500
082			_aBTS _bMONO B-1118
100			_aO'Leary,J T,Blessing,E C
245	1		_aAN IMPROVED THREE-CHANNEL CARRIER TELEPHONE SYSTEM
260			_a _b _c1939
300			_a27
500			_aBound With Bts Mono B-1100-1117,1119-1139.Lack No-1117,1119,1121,1124,1131.
700			_aBeyer,J W
964			_gCIRC
997			_aTR17365 C
999			_c404476 _d404476