A little history !
Russ Cohn, inventor and developer of NatureMill started the NatureMill indoor composting project back in 2003. The product has been evolving and improving ever since. Here is an interview with back in 2004 giving an overview of the early development and testing process:
www.howtocompost.org/naturemill.asp
A year later Russ did a follow-up in interview explaining how initial customer feedback led the development of the NatureMill :
www.howtocompost.org/naturemill05.asp
The photo on the page shows the old “mark 1” machine which is quite different to the current design.