[GreenKeys] M35 modification AG-22

[Nick England]

FYI - From an NSA publication:

This was replaced by the Teletype Model 35, extensively modified with the
addition of the special tagging keys.
NSA named the device the AG-22 and changed the output to eight-level tape.
These tapes could then be introduced directly into the OPSCOMM system. The
plan was to install these at every HF field site. Unfortunately, the
OPSCOMM system could not handle the volume of data this would produce. It
operated at only 60-100 words per minute and was
already being swamped by other requirements, such as TECSUM forwarding. The
solution, developed in 1968 and first installed in December 1969, was
STRAWHAT, a 9600-baud data link system from field sites to processing
centers. It used a time division multiplex system capable of up to
eight-level forwarding and could be patched directly from the circuit
terminal to a computer.
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