[Milsurplus] RA-10 & MN-26 Family Tree

[jfor at quik.com]

There appears to be a lot of commonality between the RA-10 and MN-26
Receivers. They clearly share a heritage, as well as some components like
the MN-20 Loop, Loop Control Boxes, and Azimuth Indicators. The RA-10 is
simpler without the L-R indicator though.

Can anyone shed some light on the family tree?

Thanks,
-John