----- Original Message ----- From: "Mike Morrow" <kk5f at earthlink.net> > The R-23*/ARC-5 from 1943 was still flying in older USN aircraft in > 1973. > That's thirty years too. I have an R-23 and the A.R.C. 5-meter RX test set, both with N.A.S. refurb tags dated in the early 1980s.