[MrFixr55]

I got lucky, I guess. I searched for Phonophor, scanned through the ads (Find Phonophor on eBay!), and sometimes one gets lucky. I found the Wikipedia article, and within the article, I found the samhallas article. I wonder if Antipodal's great-grandfather is one of the names mentioned.

These were very interesting articles as this technology precedes vacuum tubes but the inventors used inductors (transformers?) and capacitors as filters to allow Morse code and voice on the same line and possibly at the same time. and by "Line", we are talking about single conductor, the earth being the second conductor, which in itself is kind of amazing. (I don't think that using the earth as a conductor worked too well in a desert.) All of this without vacuum tubes, modulation of RF, multiplexing, etc.