[GreenKeys] FWIW - Model 28 Mark I vs Mark II

[Nick England]

FWIW - The earliest 28KSR machines (Mark I) were delivered to the US Navy
as TT-47/UG. They were quickly replaced by the Mark II model TT-47A/UG. I
have never seen a Mark I Model 28 except in the 1950 manual.

Some differences between Mark I, Mark II, and Mark III are illustrated
here,
https://www.navy-radio.com/tty/28-mark.htm
I just added a section from the 1952 TT-47A manual listing differences from
the TT-47.

Nick England K4NYW
www.navy-radio.com
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