[Milsurplus] Connector History

[Jack Antonio]

Most of us are familiar with the 1930s and early
WWII connectors typified by the PL-62 and PL-64
used on sets like the BC-375, BC-230 and -229, and
the connectors used on the Navy's RU, GF, RBM, GP
series and countless other sets.

Question is, who originated this connector design?

Was it a commercial design adopted by the military?
Military design? 

Just curious

(Also, this message is a test of another method
of sending email, I've been having some sporadic
problems with receiving emails lately.)

Jack Antonio WA7DIA
scr287 at sbcglobal.net