原來shure也做軍規品1942-1944
T-30 Throat Microphone, HS-33 and HS-38 Headset Microphone, M-CI Microphone for oxygen masks, and Battle Announce Microphone are all made for the military. Using T-30s, bomber crews could communicate over the noise inside the planes. Shure adopts strict military standards (MILSPEC) as the standard of reliability for all Shure microphones.
