Well, two can nit pick.
Bryant Pond (with a 'y', not an 'i') in Maine was a MAGNETO exchange and a FULL exchange (as opposed to a ring-down party line), and was the last such known magneto exchange in the US that cutover to dial, back in 1983, almost a quarter-century ago. It cutover to ESS, and I seem to think that it was also a digital ESS when it cutover to dial at that time.
But Bryant Pond was NOT the final cutover from electromechanical dial service to ESS (digital or not) in the US or Canada.
There were still numerous #1XB, #5XB, other non-Bell Crossbar, and all kinds of Step offices all over the US and Canada for many more years which still needed to be cutover to ESS or Digital.
The last known #1XB offices in the NYNEX and Bell Atlantic metro areas seemed to cutover to ESS (most likely digital) around 1991 or1992.
There was still at least one remaining magneto party line in the US (I don't know about Canada offhand) as late as 1990, in a remote part of Idaho in the Salmon River area. This magneto ring-down party line was known as "Shoup ID". The magneto ring-down party line was replaced with digital dial service in that year.
Other so-called ring-downs that remained mostly in California or Nevada were operator-handled individual lines but not considered Magneto ring-downs as such.
As late as 1998 and 1999, there were still numerous scattered small SXS systems in the US and Canada, mostly in rural parts of Quebec, Ontario, Ohio, Indiana, Illinois, Iowa, Nebraska, Kansas, etc. Most of these were cutover to Digital ESS before Y2K. Those in the US were non-Bell, but did include some GTE areas. Those in Canada were both Bell Canada, GTE-held QuebecTel, and small independents.
Apparently all other remaining Crossbar exchanges (#5XB as well as non-Bell manufactured equipment) in the US and Canada were all cutover to ESS or Digital before the late 1990s.
One SXS office in the small rural Quebec town of Nantes, run by the independent local French-only speaking family-owned telephone company, was cutover to a Nortel DMS-10, in June 2002. This is thought to be the last remaining "public" Step office in the North American Dial Network (US and Canada) to be cutover to ESS or Digital. Of course, some small independent telephone companies, collectors, and museums, have preserved older electromechanical equipment (SXS, Panel, Crossbar), and some have even put together an Internet/VoIP semi-private SXS telephone network! But this is not the same as electromechanical central office switches working in a "public" switched telephone network.
BTW, there are still many #1AESS offices and probably some similar non-Bell type non-Digital ESS offices remaining in the US, but it is probably under 100 such installations. I have no idea when these will eventually be cutover to digital or packet/VoIP-based switches.
_________________________________________________________________ Share life as it happens with the new Windows Live.Download today it's FREE= !