The C version came later with the introduction of ASCII ( 5 to 8 bits ) and
110 baud. So it does not go back to the 50's.
I do not know when the C version was released. The ASCII Teletype Model 35
was introduced in 1961.
-pete
On Tue, May 9, 2017 at 6:47 AM, Paul Koning <paulkoning at comcast.net> wrote:
  On May 8, 2017, at 10:27 PM, Pete Lancashire via
cctalk < 
 cctalk at classiccmp.org> wrote:
 Interesting.  Released in 1958 but that unit is stamped 10 years later.
 It would be nice to see photos of the circuit boards.  And I sure wonder
 what those rows of large relays are for.
         paul