'Willem Einthoven invented the "string galvanometer" to measure electrical charges here -- be still, mine'
heart
1903: Willem Einthoven invented the string galvanometer to measure electrical charges here -- be still, mine
Willem Einthoven invented the "string galvanometer" to measure electrical charges here -- be still, mine
Willem Einthoven invented the "string galvanometer" to measure electrical charges here -- be still, mine
1903
heart
1903