Physical characteristics and technical requirements
1921 (08 jan.; 19, 26 fev.; 05, 12, 19, 26 mar.; 02, 09, 16, 23, 30 abr.; 07, 14, 21, 28 mai.; 06, 12, 18, 25 jun.; 02, 11, 23, 30 jul.; 13, 21, 28 ago.; 04, 11, 18 set.; 02, 09, 16, 23, 30 out; 06, 13, 20 nov.; 04, 13dez.)
1922 (15,22 jan.; 05, 19, 26 fev.; 05, 12 mar.; 02, 16 abr.; 07 mai.; 20 jul.; 10 ago.)