The current supplier of n'lock to the public is
https://n-lock.com/who claims it is a Danish design!
We know better; I spoke to the designer of the n'lock (and of its licensed predecessor, now long off the market) Franklin Niedrich, and bought one of the last few n'locks made before he sold the project on and retired. Julk is another Thorn Forum member who bought his n'lock in Herr Niedrich's time.
Thanks for the current link and sales point to JohnR.