[GreenKeys] Help dating early Model 14

[Jim Cooper]

On 22 Jan 2026 at 10:55, Harold Hallikainen via GreenKeys wrote:

> Or, the whole thing could be automated entirely electromechanically.
> Each message would have a series of routing codes at the beginning of
> the message. 

Look into the M28 "R/T Sets" ....  BIG cabinets with two 
typing reperfs, each with a 'moving head' LXD TD that read 
the tape from the reperf right up to the punch block. 

Message comes in to the rcv reperf associated with the 
outgoing circuit, which the LXD tape reader keyed to relay 
the message. 

In my younger days (late 1970s) I designed an entire 
worldwide message switching center for PanAm Airlines 
which took up an entire floor of the NYC PanAm Building !!
Used stunt box coded switching, and connected all the major 
PanAm hubs around the world.  About five years later, it was 
replaced by computer switching -- no stunt boxes, no relays, 
no paper tape.   :(

Jim  W2JC