[Milsurplus] Army radio sets 1931

[Hubert Miller]

"Army Extension Courses No. 97, Field Artillery Signal Communication, Technical Communication", gives one view of Army radio in 1931.
I found this interesting:
The SCR-77B  range given as 5 miles; status = in service
SCR-131, 161 later loop sets, range given as 15 miles, status = in development
SCR-171 same appearance as loop sets but uses "L" wire antenna, range 15 miles.

The latter 2 sets used, per text, in Field Artillery only; first two, both F.A. and infantry at regiment and battalion level.
-Hue
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