title: Early use of x-ray machines and electrocardiographs at the Pennsylvania Hospital 1897 through 1927.
mesh_terms: D003365:Costs and Cost Analysis; D004562:Electrocardiography / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D006739:Hospital Administration / Q000266:history; D006761:Hospitals / Q000266:history*; D013677:Medical Laboratory Science / Q000266:history; D008499:Medical Records / Q000266:history; D010414:Pennsylvania; D011859:Radiography / Q000191:economics / Q000266:history*; D013679:Technology, Radiologic / Q000266:history