000			00343pam a2200133a 44500
082			_aBTS _bMONO 1951
100			_aFagen,M D
245	1		_aPERFORMANCE OF ULTRASONIC VITREOUS SILICA DELAY LINES
260			_a _b _c1951
300			_a10
500			_aBound With Bts Mono 1930-50,1952-59 Lack No.1932
964			_gCIRC
997			_aTR19493 C
999			_c402576 _d402576