Physical characteristics and technical requirements
1928 (01, 15, 22 jan.; 05, 09, 16 fev.; 01, 22 mar.)
1929 (31 jan.; 10, 14, 21 fev.; 03, 14, 21, 28 mar.; 04, 11, 18, 25 abr.; 02, 09, 26, 30 mai.; 13, 20, 30 jun.; 11 jul., 04, 11, 15 ago.; 31 out.; 14 nov.)