“The Collection”  is divided into two pages:

They  are directly accessible through the menu bar via “The Collection”.

Each collection page shows thumbnails of calculators with one or more clickable icons in the thumbnail corner:

Available information for the calculators in this website

 More info is available.  It always includes more photo’s of  the calculator.

Contains photo’s of the internals.  If a calculator did not work at receival repair information is available.

A  video is available mostly showing basic operation.  For some an internal view is present.

For some calculators I have found assets like adverts, price lists etc.

I found them on other sites. If I still know the source, it is mentioned.  

The Collection Mechanical & Electronic Calculators