000			00371pam a2200133a 44500
082			_aBTS _bMONO B-585
100			_aFrederick,H A
245	1		_aTHE DEVOLPMENT OF THE MICROPHONE
260			_a _bElectrochemical Society, Usa _c1931
300			_a29
500			_aBound With Bts Mono-B-580-584,586-598.Lack No-B-587,599,594-595.
964			_gCIRC
997			_aTR16537 C
999			_c397868 _d397868