Karcher who? what?

Karcher, any information appreciated, 7mm walking stick cartridge I think?
Who manufactured?
Had some info but have to take some pills of a morning that tent to cause problems till about lunch time, simple things like deleting and not discovering until the recycle bin empty, or I might be getting older!!!

French circa 1885 for walking stick and saloon pistols is the info I have.

Some Info on Karcher:

Paul Karcher (also known incorrectly as

Thank you gentlemen.
Covers the subject well, WBD.