I've been looking all over the place for more information about this Tycos Type D altimeter. I know where it came from and that it was made for the Aviation Section, U.S. Signal Corps in WW1. Besides that though, I've not been able to find a single shred of info online. I can't even find another example of the Type D which is leading me to believe that I have something extremely rare here. If anyone knows anything please let me know.
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