title: Where are today's pioneering manufacturers of electrocardiographs?
mesh_terms: D004562:Electrocardiography / Q000266:history / Q000295:instrumentation* / Q000592:standards; D004566:Electrodes; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D013672:Technology / Q000266:history