Originally Posted by
Genghis the Engineer
(I did find something about enigma machine mechanisms also having been patented in the late 1920s in London by Chiffriermaschinen Aktiengesellschaft, but not much on that either).
The origins of the Enigma and the original inventor Arthur Scherbius are covered in several books, but the gist of it is on this Wikipedia page:
https://en.wikipedia.org/wiki/Arthur_Scherbius
The book referenced on that page, David Kahn's '
Seizing the Enigma' is a good read on the subject.