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:
- 1743 ------ Charpentier's Pocket Calculator
Catalog page from the 1895 catalog
- 4020 ------ Charpentier's Pocket Calculator
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.
- 1895 -- The 1743 was introduced.
- 1901 -- The 4020 model was introduced replacing the1743 model.
- 1913b - The 4020 was not shown in the soft bound version of the 1913 catalog.
- 1922 -- The 4020 was not shown in the soft bound 1922 catalog.
- 1932 -- The 4020 was last shown in the 1932 soft bound catalog
Links to catalog pages for the 4020 family of slide rules:
Scans: Link to scans of Charpentier's Calculator