Sussner Nopitsch Glocken Bell

From Georg Büttner’s site about German pencil companies in the Nuremberg area, here’s what I gather (imperfectly — I don’t speak German) about the relationship between these companies:

G.W. Sussner founded a pencil company in 1846. Moritz Nopitsch founded a company in 1861, which was passed on to his son Gebrüder Nopitsch.  Nopitsch and Sussner were joined in 1900. In 1925, the company was named Glocken (in English, Bell); the name was acquired from another company named Glocken.  (Was that whole company acquired?)

Sussner:

M. Nopitsch:

M. Nopitsch and Sussner:

Gebrüder Nopitsch:

Glocken:

Bell:

Some of the older hexagonal pencils have what appears to be factory sharpening in the form of six facets —