 During the 1920s, some hockey cards were printed by food and candy companies, such as Paulin's Candy, Maple Crispette, Crescent, Holland Creameries and La Patrie.Through to 1941, O-Pee-Chee printed hockey cards, stopping production for World War II.Presumably, the 1941 involvement of the US in the war affected the hockey card market, since Canada had been in the war since 1939.