The Virtual Typewriter Museum: Hansen writing ball

If it was done in 1870, the design is past copyright expiration. Would be a fun project to recreate this machine- specially with 3D printers making it more accessible to make. Anyone know where we might find the actual design?

More on Nietzsche's use of it:

http://www.malling-hansen.org/friedrich-nietzsche-and-his-ty...

It has a very... steampunk aesthetic to it.