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

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

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)

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

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

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

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.

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

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

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

Founding of the Eisenmann site in Shanghai, China

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

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

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.

Acquisition of Ruhstrat GmbH by Eisenmann AG

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

Relocation of the headquarters of Ruhstrat GmbH from Lenglern to Bovenden

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

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

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.

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

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

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

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.

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.

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.