US on sale Navy Bureau of Aeronautics Oxygen Mask Microphone Assembly ANB-M-C1 Original Mic, Box, & Instructions Rare Militaria Collectible

on sale Vintage US Navy Bureau of Aeronautics oxygen mask microphone unit ANB-M-C1 manufactured by Western Electric. Naval M.S.A. demand-type O2 mask mic adapter comes with its original box & installation instructions. This rare apparatus is in vintage condition as pictured & has been untested.

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