1897 Lime industry is born in Virkkala
Karl Forsström, a sea captain, builds the first shaft kiln in Virkkala for burning lime. Petter Forsström takes the helm of this industrial enterprise of Lohja Lime Factory.
1907 A rotary kiln is built
The first rotary kiln is brought into operation, raising capacity five-fold.
1911 Tytyri limestone deposit
The limestone deposit situated in Tytyri is rented but will be returned in 1930's.
1914 Lojo Kalkverk – Lohjan Kalkkitehdas (The Lohja Lime Factory) is established as a limited company.
1919 Lohjan Sähkö is founded
The production of cement starts in Virkkala after the first world war. Lohjan Sähkö Oy (The Lohja Electricity Ltd) is founded.
1924 Lohjan Kalkkitehdas buys the mining industry of Ojamo where lime is mined until 1965.
1927 Lohjan Kalkkitehdas becomes a publicly listed company.
1935 Saseka is founded
Oy Saseka Ab is established to produce mortar bricks. Two years later Petter Forsström takes a majority holding in Saseka. The name Saseka comes from the Finnish words santa (=sand), sementti (=cement) and kalkki (=lime).
1937 Lohjan Kalkkitehdas acquires the rights to the limestone deposits in Sipoo.
1939 Lohjan Kalkkitehdas takes a majority holding in Oy Rudus Ab.
1946 Tytyri for Lohja
The limestone deposit of Tytyri is partly bought and partly rented again for 50 years. Two years later the Tytyri lime factory starts to function.
1947 Lohjan Kalkkitehdas acquires Iskumetalli Oy (Impact Metal Ltd), a company specializing in pumps.
1949 Iskumetalli Oy starts manufacturing Luxor radios under licence in Lohja.
1958 Rudus sets up the first Finnish ready-mixed concrete plant in Helsinki.
Iskumetalli Oy starts manufacturing black-and-white television sets.
1961 Saseka is merged with Lohjan Kalkkitehdas.
1962 Petter Forsström retires. Petter's nephew Börje Forsström is appointed President.
1964 Lohjan Sähkö Oy and Iskumetalli Oy are merged with Lohjan Kalkkitehdas.
1971 Lohja acquires Lahden Betoni Oy (Lahti Concrete Ltd) and production of municipal products starts.
The factory of Iskumetalli Oy is renamed Finlux and next year the production of colour televisions starts with the Finlux brand.
1972 Two further acquisitions: Betonila Oy, which manufactures concrete piles and elements, and Betonisora Oy, a concrete aggregates producer.
1973 Risto K. Alanko is appointed President.
1975 The company is renamed Oy Lohja Ab.
1975 Production of Solifer caravans begins in Vuosaari, Helsinki.
1977 Lohja buys a research project related to electroluminescent flat screens from Instrumentarium Oy.
1978 President Risto K. Alanko dies in a flying accident.
Georg Ehrnrooth is named President next year.
1979 Lohja acquires Turku-based television manufacturer Asa Radio Oy and a majority holding in Oy Kafi Ab, which makes caravans in Teuva, Ostrobothnia.
1981 Lohja acquires paint and printing ink manufacturer Oy Winter Ab in Tampere.
1984 Lohja acquires ready-mixed concrete producer Southern Ready Mix Inc. in the USA.
Lohja Microelectronics is founded to support the development and production of electroluminescent display. Later on it becomes Elcoteq.
1988 Lohja acquires caravan manufacturer Polar & Sävsjö in Sweden.
1989 Southern Prestressed Inc., established in the USA, acquires ten concrete element factories from Florida Mining and Materials Inc.
1989 Announcement of plans to merge Oy Lohja Ab and Oy Wärtsilä Ab.
Next year the extraordinary general meeting of Lohja shareholders approves the merger plan.
