Walter, for you Rb box, look for info on the common Efratom standards of
that vintage, and see if any look like what you have inside the plug-in.
I remember the FRK and M-100 (a variation of which I have). These are
the ones in about a 4 inch cube format. They may not exactly match
yours, but there may be enough similarities to help figure some things out.
Ed
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