[GreenKeys] strange Teletype?

[Charles Ring W3NU]

jhhaynes at earthlink.net wrote:

> It's called Monopulse, is a Teletype product designed for very short
> distance transmission, such as within a plant.  It depends on the
> transmitter and receiver being on the same power system, so that the
> sync motors in both remain pretty much in phase.
>
> The beginning of a pulse from the transmitter starts the typewheel
> rotating in the printer.  The end of the pulse from the transmitter
> causes the print magnet to operate at the current position of the
> typewheel.  Hence each character is a single pulse, the time duration
> of which determines which character will print.
>
>
> jhhaynes at earthlink dot net
>
>
Now I wonder what justified its existence. When was it made? Does it 
have a TTY model number and if not why not? Depending on when it was 
made, was it that much cheaper than a 14 strip printer with keyboard to 
put up with a keyboard like that?

73 de W3NU