... tubeOperation methodPushUsagemicrophoneReed Pipe Reed PipeOriginSlide timesLifeCotoNetherlands10,000 to 15,0001 year to 14 moths125America30,000 to 50,0002 years and a ... half to 3 yearsMKARussia30,000 to 50,0002 ... years and a half to 3 yearsOKIJapan50,000 to 80,0004 yearsDetail PicturesFactory picturesPackaging detail ESD antistatic ...