[GreenKeys] Model 28 Compact

[Duncan M. Brown]

There has been a lot of mention of the AN/UGC-20 recently.  

What was the designation for its the basic TTY unit??  Was it the TT-176?? 
Besides the TT-???,  what else comprises an AN/UGC-20??

I'm not familiar with the "Model 28 Compact"  was it a military or
commercial model??

The AWA Museum has a TT-176.  It is a M28 in a "tight" cabinet with the
LESU mounted behind it.

Thanks for any info,

   Duncan
   K2OEQ