[GreenKeys] M28 tape teletypewriter

[Jack]

Sounds right to me. The three-speed versions were on test boards for private
line TTY circuit testing. Sometimes they would mount the machine on a cart
so they could roll it around in the TTY carrier bays.

Jack K2TTY

-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Jim
Haynes
Sent: Thursday, August 25, 2016 5:29 PM
To: Nick England <navy.radio at gmail.com>
Cc: Greenkeys <greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] M28 tape teletypewriter

Some guesses:  Prior to the Dial TWX cutover, for use on manual TWX
switchboards if they needed new ones after Model 14s were no longer being
made.

For use on telegraph test boards and service boards when they needed
the ability to operate at 100 wpm.

I'm sure our Bell System guys have better knowledge.  Do the parts have
Bell or non-Bell name plates?  e.g.  "28-A Keyboard" versus "LK-123"
Does the machine have a gear shift?

No gear shift and geared for 60 wpm would suggest TWX switchboard.
Gearshift would suggest telegraph test/service board.
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