title: E. FLETCHER INGALS, PIONEER ENDOSCOPIST.
mesh_terms: D001999:Bronchoscopy; D004724:Endoscopy; D004945:Esophagoscopy; D005765:Gastrointestinal Agents; D049672:History, 19th Century; D049673:History, 20th Century; D008511:Medicine; D014481:United States
chemical_list: D005765:Gastrointestinal Agents
keywords: BIOGRAPHIES; BRONCHOSCOPY; ESOPHAGOSCOPY; HISTORY; HISTORY OF MEDICINE, 19TH CENT.; HISTORY OF MEDICINE, 20TH CENT.; UNITED STATES