Leonhard ran a business dealing in colonial goods and textiles at what is now Sankt Martiner Straße 5 in Maikammer.

Franz completed a four-year banking course in Neustadt an der Weinstraße, and together they built the first factory hall on the Dieterwiesen grounds.

[1] The factory provided the primary source of income for many households, although viticulture and agriculture remained secondary occupations.

[1] Due to a shortage of local labor and raw materials, Franz Ullrich and his sons Gustav and August sought a location for another factory.

Franz Ullrich and his sons Gustav and August relocated to Annweiler to manage the new company.

The Maikammer firm suffered severe economic losses during World War I, ceasing ruler production in 1918.

[1] In honor of the Ullrich brothers, a folding ruler sculpture was installed as a piece of art at one of the roundabouts in Maikammer.