Pupin and the loading coil

Pupin

source: https://www.youtube.com/watch?v=aRUsfIW1aYM
  

 Some internet links on Pupin and the loading coil:

https://en.wikipedia.org/wiki/Loading_coil

https://en.wikipedia.org/wiki/Mihajlo_Pupin

 
Michael Pupin, from Immigrant to Inventor

htm: https://www.gutenberg.org/files/66886/66886-h/66886-h.htm

pdf: https://www.eserbia.org/images/books/Michael-I-Pupin-From-Immigrant-to-Inventor-1924.pdf

Note that the video doesn't mention him but apparently this guy:

Campbell

https://en.wikipedia.org/wiki/George_Ashley_Campbell
 

had also patented the idea (at AT&T) so AT&T bought Pupin's patent to prevent any legal wrangling ?  We know that these patent and IP tussles (such as Armstrong versus RCA or Edison versus Tesla) are exhausting, expensive and time consuming.

But still, I had never heard of Pupin before - and I used to work for a telephone company :)

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm