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 ONEJOON

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.

Beginning under the name Ruhstrat, Adolf and Ernst Ruhstrat developed the first resistance-heated high-temperature furnace in 1896 in cooperation with the later Nobel Prize winner Prof. Walther Nernst  as well as Prof. Gustav Tammann from the University of Göttingen. This furnace reached temperatures of up to 3,000 °C. Just two years later Ruhstrat received commercial orders for the development and construction of customized high-temperature industrial furnaces.

How we rose from a small electrical store to a global player and how Ruhstrat GmbH became Eisenmann Thermal Solutions and finally ONEJOON GmbH in 2015, you will learn on your personal journey into ONEJOON's past.

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

1888

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 and construction of the first resistance-heated high-temperature furnace

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1910

Elektro-Schalt-Werke AG

Elektro-Schalt-Werke AG was singled out by Ruhstrat as a special factory for electrical apparatus. During the war, it supplied the Reichsmarine with emergency lighting, but was left out of the tender for two new armoured cruisers. In addition to automatic emergency lighting, especially for gas shelters, the company concentrated on the manufacture of contact resistors and high-temperature electric melting and annealing furnaces. Source: Göttingen I | Frank Baranowski (rabaranowski.de)

1911

Expansion of the company building at Langen Geismarstraße 74 to include the business premises at Langen Geismarstraße 72/73

1921

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

Learn more at Measurement Valley
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.

Learn more in the Göttingen City Archive
1956

Division of Gebr. Ruhstrat into two independent companies: Adolf Ruhstrat and Ruhstrat GmbH

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1961

Ruhstrat GmbH moves its official company headquarters to the 6000 sqm modern industrial plant in Lenglern to increase capacity

1971

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

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2003

Founding of the Eisenmann site in Shanghai, China

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

2008

Start of cooperation between the Eisenmann Group in Böblingen and Ruhstrat GmbH in Bovenden

Learn more about Eisenmann
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

Ruhstrat GmbH was integrated into the Eisenmann Group as a subsidiary as of October 19, 2011.

2013

Relocation of the headquarters of Ruhstrat GmbH from Lenglern to Bovenden

2015

Ruhstrat and the Eisenmann Process and High Temperature Technology Business Unit will become Eisenmann Thermal Solutions
GmbH & Co. KG

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

Transfer of the "Electrical Technology" business area from Eisenmann Thermal Solutions GmbH & Co. KG to RPT Ruhstrat Power Technology GmbH

2019

Insolvency of the Eisenmann Group and Eisenmann Thermal Solutions GmbH & Co. KG

2020

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

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2020

Opening of the ONEJOON Inc. locations in Minneapolis and Atlanta, USA

As one of the youngest members of the ONEJOON Group, we offer our product and service portfolio on the North American market.

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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 125 years of expertise in the manufacture of customized high-temperature industrial furnaces, which are used for the heat treatment of a wide range of materials and whose applications are in the most diverse 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
3erteaser Ingenieruskunst

High quality engineering

From craftsmanship to industrial engineering read more

Impressive personalities

Of founders and Nobel laureates read more
We celebrate our anniversary!

125 years of expertise in industrial furnace construction

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