Advance
Mulltimmer Masugn
Swedish Iron, prized for its purity and strength, supplies not only our domestic needs but also the foundries and armories of nations across the continent. The Mulltimmer Masugn was not built just with stone, but also with wood isolated with sand, gravel and dirt.
FinlandCountrypotential
SwedenCountrypotentialAdvance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Discovery tree itself.
Modifiers
Iron Output+10%
Definitionin_game/common/advances/country_SWE.txt:51
58content_priority = 100