[Milsurplus] More questions on AN/XXX

[J. Forster]

In the AN/XXX nomenclature, there are prenumbers for the individual components:

AT-1/APN-2
ID-14/APN-1
MD-7/ARC-5
R-20/ARC-5
RT-1A/APN-2
SA-1/APN-1
T-20/ARC-5

The meanings of these examples are pretty obvious, but does anyone have a
complete list?

Thanks,
-John