I've got one in the metal case. On the back is a property tag: Teledyne Ryan Aeronautical E.T. "028400a" [<- the 'a' in pen] Gov't I.D. "MDA9729530013" Prop. of "USAF" R-5051-2-REV.5-93
Where the stuff in quotes is from a typewriter, the rest is form boilerplate. There are also some inventory control stickers from 1999 and 2001. I made a new EPROM that made it output a unique code for each key, but I'd have to dig up the notes to say anything useful. I never figured out what the daughter board was for and just removed it. b
