

The Original Odner pinwheel calculator from the 1940s, see the nice link of Kevin below
The modern Odner pinwheel calculator from the late 1960s and early 1970s
An early bakelite Aktibolaget Dixma from the 1940s
An Aktibolaget Original Odner, 10 key, model H9.S3a
| J. Kevin Odner |
