Overall gear reduction of the mechanics 1382/22 (H135 electric) with motor set 1382/100:
1st stage (Ord.No. 260/70:138/31): 70:30 = 2.3
2nd stage (Ord.No. 266/70): 70:25 = 2.8
3rd stage (Ord.No. 260/70:138/23): 70:23 = 3.04
Total reduction: 2.3 * 2.8 * 3.04 = 19.6