The origins of the pencil factory Leopold Illfelder & Söhne lie in 1856, when Daniel Berolzheimer and Leopold Illfelder already founded the pencil factory Berolzheimer & Illfelder. When Daniel Berolzheimer died in 1859, his son Heinrich Berolzheimer took over his share of the company. Together with Leopold Illfelder, a branch office (Berolzheimer, Illfelder & Co.  or B. Illfelder & Co.) was founded in New York in 1861, later "Illfelder Importing Co" or "Eagle Pencil Co.".

In the Fürth address book from 1859, the following entry can be found - First main district, Hallstraße, house number 301 b,   Besels, Moriz, merchant and manufactory goods dealer

In the Fuerth address book of 1859, the following entry is found - First main district - Alexanderstraße - house number 292a

Neuburger Emil, part-owner of the hop, wool and product shop, Gebrüder Neuburger, - Alexanderstraße 298 - Neuburger Isaak, part-owner of Gebrüder Neuburger, number 292 I,

The company A. N. Holzinger was an agency business in textile goods.

D. M. Zimmer operated the company "Galanterie- und Spielwaren en gros u. Export D. M. Zimmer".