[GreenKeys] What Teletype machine is this?

[Jim Haynes]

On Mon, 16 Dec 2013, Charles Ring wrote:

> The angle of the picture might be hiding things but I don't see any 28-type 
> features in this machine.
>
It's an early experimental machine.  The 28 type feature in it is that
a belt carries the typing element across the page, and another belt
positions the typing element to the character that is to be printed.