1920s and 1930s Events By dhairya815 Jan 5, 1921 Agnes McPhail In document Jan 22, 1922 Discovery of Insulin In document Sep 15, 1922 Canadian Tire In document Apr 1, 1924 Royal Canadian Airforce In document Sep 28, 1928 Penicillin In document Oct 29, 1929 Great Depression Begining In document Oct 23, 1935 William Lyon Mackenzie King In document Nov 2, 1936 Canadian Broadcasting Corporation In document Apr 10, 1937 Trans Canada Airline In document Jun 29, 1937 Snowmobile In document
