125 years of industrial furnace construction

Our company history

From small electrical store to global player

A company in the change of time

From Ruhstrat to Eisenmann to ONJEOON

Let yourself be impressed by how the change of time has shaped our corporate culture and how a small electrical store in Göttingen has risen to become an internationally active global player that offers you the perfect solution approach for your individual requirement.

Join us on an exciting journey through the transformation of our corporate history....

1896-1921

Foundation and opening of a small electrical store in Göttingen by the brothers Adolf and Ernst Ruhstrat

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1896

Foundation of the furnace construction division at Ruhstrat GmbH and construction of the first resistance-heated high-temperature furnace

1911

Move from Lange Geismarstraße 74 to Lange Geismarstraße 72/73

1921

Founding of the Göttinger Werke VGW association, the forerunner of Measurement Valley - Ruhstrat is a founding member

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Elektro-Schalt-Werke AG

1933

Start of international expansion into other European countries and the USA - export business already accounted for 40% of total sales

1938-1945

The dark times of Ruhstrat as a Wehrmacht company in the midst of forced labor

During World War II, Ruhstrat produced blackout devices, emergency lighting, dropping weapons, accessories for the Luftwaffe and explosive mines as well at its main plant.

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1951

Founding of the Eisenmann company in Böblingen as an engineering office with the manufacture of wood drying plants

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1956

Division into two independent companies: Adolf Ruhstrat and Ruhstrat GmbH

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1961

Ruhstrat moves its official company headquarters to the 6000 square meter modern industrial plant in Lenglern to expand capacity

1971

Ernst Ruhstrat is co-initiator of the later HAWK University of Applied Sciences and Arts in Göttingen

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2003

Eisenmann Shanghai focuses primarily on business with the automotive industry. Initially, the site employed 5 people.

2008

Start of cooperation between Eisenmann Thermal Solutions and Ruhstrat

2009

Eisenmann Shanghai expanded with business unit Thermal Solutions

The Thermal Solutions business unit mainly focused on the porcelain & enameling business and the carbon fiber industry. The number of employees at Eisenmann Thermal Solutions in Shanghai increased from 1 to 6.

2011

Acquisition of Ruhstrat GmbH by Eisenmann AG based in Böblingen

Specification on the construction of high-temperature industrial furnaces as well as transformers and resistors.

2013

Relocation of Eisenmann headquarters from Lenglern to Bovenden

2015

Ruhstrat and the Eisenmann Process and High Temperature Technology Business Unit will become Eisenmann Thermal Solutions

2016

Start of cooperation between Eisenmann Thermal Solutions and ONEJOON Co., Ltd. in Suwon and Hwaseong, South Korea

2019

Foundation of the Chinese joint venture "ETS Zhejiang Co. Ltd." between Eisenmann Thermal Solutions and ONEJOON Korea

In June 2019, the subsidiary "Eisenmann Thermal Solutions (Zhejiang) Co.,Ltd" was founded in China and the number of employees increased from 6 to 12.

2019

Insolvency of the Eisenmann Group and Eisenmann Thermal Solutions GmbH & Co. KG and sale of the transformer construction and resistors business unit

2020

Takeover by our South Korean parent company ONEJOON Co. Ltd. and change of company name to ONEJOON GmbH

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2021

Opening of a production site in Poland

ONEJOON Poland sp. z o.o. is a Polish subsidiary of ONEJOON GmbH for the production of industrial furnaces for the European market at the Gliwice location.

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2021

125 years of expertise in industrial furnace construction

We look back on a 125-year track record in the construction of customized high-temperature industrial furnaces used for heat treatment of various materials for various industries.

You want to know more about our origin and developments?

Take a look at the following pages and experience our company up close. Enjoy your personal journey into ONEJOON's past.

We celebrate our anniversary!

125 years of expertise in industrial furnace construction read more

High quality engineering

From craftsmanship to industrial engineering read more

Impressive personalities

From founders to Nobel laureates read more
We celebrate our anniversary!

125 years of expertise in industrial furnace construction

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