Winona
→Links
00:18
-108
00:16
-89
no edit summary
00:11
+23
→Success in Nicaragua
00:07
-12
00:06
-214
Marktielewestra
12:28
+568
New page: In the water sector, as elsewhere, good ideas can be surprisingly old. One such old idea is the rope pump, which is over 2000 years old and was used in ancient China. A rope pump consists ...
12:19
+5,074
