[GreenKeys] More mysteries

[John, W9DDD]

Here's a box that's mounted under a 28 RO.

That looks to be a FSN number on it, but I can't find it that way. 
What's the deal with FSD, NSN, and FSN?  They look similar.

I suspect these (I have 2 that look the same) came from FAA systems, so 
probably from an ADIS installation.

Speaking of FAA, does anyone need a 14 base with the special FAA slip 
connections (rotated 90 degrees from normal) FTGH

-- 
John, W9DDD
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