Identity originally designed by Marti Mykkänen in 1960 and modified by Kyösti Varis and Esa Ojala in 1995.
Helsingin Energia Design guidelines
Helsingin Kaupungin Sahkolaitos
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Identity originally designed by Marti Mykkänen in 1960 and modified by Kyösti Varis and Esa Ojala in 1995.