Ziegler & Co was a Swiss-British company based in Sultanabad (now Arak). The company distinguished itself from other producers in Sultanabad in several ways: first, by designing many of its own carpets with European tastes in mind.
Secondly, it maintained its own yarn dyeing plant at Sultanabad, thereby controlling the quality of dyeing. It appears that the company was also innovative in making small sample rugs (vagireh) as models for their weavers to work from.
By all accounts, the business was very successful. The new production of good, cheap Persian carpets from Ziegler & Co helped to change the prevailing style of interior design in the last decades of the 19th century.