Purpose of this Presentation

This is a privat website only for research and documentation of information about calculating devices. There is no commercial purpose.


A German court decided that the owner of an internet site is responsible for the content of all links in his site. But he is free of liability when he declares not to be associated with the content of the linked sites. So I declare that I am not associated with the content of all linked sites.
All content of my site I arranged as well as I could. But if I should have violated the rights of other persons or institutions please apologise and send me a notification for correction.


The use of texts and pictures of this site is free for non commercial purpose. But you must point out the source "".


Please send your questions, corrections and additional information to .

Wolf-G. Blümich, 13.05.2006