[Premium-Rx] Original use of Premium Radios

[Blair Batty]

Hi All:

Given the fine specifications and special features (e.g. 455 IF out,
remote control, simultaneous Upper and Lower sideband) of  many of
the premium radios I wonder how they were originally used, and
with what equipment?

For example, I've been told that in Military or an Embassy, one (of a bank
of these radios) might be permanently set to one frequency, in the ISB mode.
The Upper sideband would  drive one teletype and the Lower sideband
another teletype.

What would the 455 Hz IF Out be useful for? How else would the radios
be used, besides the usual voice communications?

Sincerely
Blair Batty
Canada