[GreenKeys] Distributor of Sorts

[Jim Haynes]

And, we might add, keeping sending and receiving distributors in sync at
the ends of a wire was high technology for its day.  You can read a lot
about it in Western Union Technical Review 
massis.lcs.mit.edu/archives/technical/western-union-tech-review/

Teletype made some synchronous sytems, but what made the company a big
success was the introduction of start-stop synchronization.  Synchronous
operation was usable only between big telegraph offices where there were
maintenance people on hand to keep the distributors running in sync.
Start-stop made printing telegraphy practical on lower-traffic circuits
where maintenance people were not stationed.