Collection of pages from K&E catalogs for the 4020 Charpentier's Pocket Calculator


The Charpentier's Pocket Calculator was marketed by K&E but was manufactured in France

The following K&E model numbers are part of the 4020 family:

Catalog page from the 1895 catalog

Catalog page from the 1903 catalog


The following is a list of catalog entries from 1901 to 1931. It is not know why but the 4020 was not shown in the soft bound 1913 and 1922 catalogs.

Links to catalog pages for the 4020 family of slide rules:

Scans: Link to scans of Charpentier's Calculator