[GreenKeys] Newly-discovered resource

[Jim Haynes]

New to me, anyway

http://www.americanradiohistory.com/Tele_Tech_Master_Page_Guide.htm

has a bunch of issues of Tele-Tech magazine scanned, and they are 
searchable.  For instance, searching on teletype, you gt among other
things a reference to the February 1947 issue with an article about
the Model 31 printer and an FSK modem used with it.

jhhaynes at earthlink dot net