[Milsurplus] Interphone etc. question late 1930s

[Hubert Miller]

I mentioned before here that I have a BC-224-A, BC-307-A, and BC-310.
As no one, at least in the online groups, wants to pay the ~ $2K I think they're worth together, it looks like I will be keeping them for some years yet.
I do want to keep these 3 radios associated with the B-18 and early B-17 together. I am certainly loathe to ever have them go to an overseas buyer
via auction.
Anyway, since I want to keep these together, I ask: what might I look for in the way of associated interphone amplifiers, beam filters, and / or
switch boxes ? I have the BC-347 and BC-366, but I think they're too late.
Also, I am always interested in leads for a manual or at least schematic for the BC-310 RDF receiver.
thanks-
Hue
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