What are the release dates for Professor Beware - 1938?

Professor Beware - 1938 was released on:

USA: 20 June 1938

USA: 13 July 1938 (premiere)

Netherlands: 29 July 1938

Denmark: 19 August 1938

Finland: 11 September 1938

France: 14 September 1938

Portugal: 16 February 1939