Certainly interesting but no, definitely not for microphones. The one with the blue snout is also interesting, possibly done post war. I would have to agree with blackcat, it makes sense for use with aircraft where there is a fresh oxygen supply.
Certainly interesting but no, definitely not for microphones. The one with the blue snout is also interesting, possibly done post war. I would have to agree with blackcat, it makes sense for use with aircraft where there is a fresh oxygen supply.
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