The development of Digelius Electronics Finland (DEF) in the documentary evidence

The spreadsheet consists of notes about the appearances of Digelius Electronics Finland in the historical documentary evidence depicting the rise and fall of the company. Digelius Electronics Finland was a Finnish small scale industry engineering company initially founded to design and build Erkki Kurenniemi's electronic musical instruments. The data set produced as a part of the PhD project "The user stories of Erkki Kurenniemi’s electronic musical instruments" by the author. PI and contact information: Mikko Ojanen / https://orcid.org/0000-0002-7833-9659