The German company Petag, short for Persiche Teppich-Gesellschaft AG, was founded in Berlin in 1911, even though some sources speak of 1885.
Under the inspiration of Heinrich Jacoby, a large manufactory was started up in Tabriz (north-west Iran) from the 1920s onwards.

This was intended to counter the decline in quality that resulted from the over-commercialisation of production at the demand of
the West.

The result was outstanding ; in excellent wool qualities, masterfully vegetal-coloured, old rich motifs from the 16th and 17th centuries were revived.

The atelier's different qualities refer to the knot density: Pertovi, Hamajun, Teimuri, Rustem and Cyrus. The workshops were closed in the 1940s.

Heinrich Jacoby remains an authority in the world of Oriental carpets.
For instance, in 1923 he publishes " Eine Sammlung orientalischer Teppiche ", in 1949 " ABC des echter Teppichs " and he collaborated on the standard work of Arthur U. Pope " A Survey of Persian Art " with his contribution " Materials used in the making of carpets ".
An American missionary, active in the area, noted in 1913 the following
in connection with the workshops Petag :
'This year has brought the poor people in Tabriz something to be happy about.
A German firm has set up a carpet workshop, where a lot of
people from the city and surrounding villages have found employment.
We are getting used to the strange sound of the steam whistle that calls the workmen in the morning to start work and releases them at noon and
evening releases again. And better still, we hear this sound on six days
of the week, but on the seventh day it is silent and the doors remain closed for the employer and the workmen to enjoy the Christian day of rest to enjoy.'

The Petag carpets can be recognised by the shintamani sign knotted into the corner of each piece.