Eija Lesonen

Proventia Group Oy provides technologies and services for engines. It develops engineers and supplies customized exhaust after treatment solutions for diesel engines in retrofit installations. The firm produces insulation solutions for thermal management for engine and machine applications. In addition, it offers a selection of testing services and transportable Proventia Test Units for engines, emissions, fuels, and lubricants. The company was founded in 2001 and is headquartered in Oulunsalo, Finland.

JOT Automation Oy engages in the automated production testing of wireless products. It offers functional and performance testing, optical inspection, and software programming. The company also provides assembly solutions and testing equipment. JOT Automation was founded by Veikko Lesonen in 1988 and is headquartered in Oulu, Finland.

Part of Head Invest Oy, Head Tech Ltd. is a Finnish company that provides test and production solutions and systems for the manufacturing industry. The company is based in Oulu, Finland. The CEO of the company is Mikko Sipilä.