> On May 9, 2017, at 4:41 PM, Pete Lancashire <p...@petelancashire.com> wrote:
>
> The relays were from WECO. Made by the millions, they were the ones used in
> all Bell telephone exchanged from the early 50's up to the ESS (electronic)
> exchanges. Remember seeing ones with less then a full compliment of contacts,
> but that was pretty uncommon.
>
> https://archive.org/details/bstj31-6-1023
Nice, thanks. I recognize the older "U" style relays, my father used a bunch
of those in various ham radio projects.
The end of that article describes Wire Wrap technology. I wonder if that was
the first time it appeared.
paul
