Well ... Χ-3 404, 405 M 18:8 M 20:3 ... 16 March 1937
Well ... Χ-4 710, 711 M 18:8 M 18:1 ... 20 April 1937
Well ... Χ-4 712, 713 M 18:1 M 18:8 ... 21 April 1937
Well ... Χ-4 692, 693 M 18:8 M 18:1 ... 14 April 1937