7 ene 2000 año aC - Shaduf was invented
Descripción:
 Shaduf was a hand operated system of lifting water.  People in Egypt and India still use it today.The shaduf is made of a horizontal beam.  It has a bucket or skin on one end to hold the water in it and a counterpart a little heavier on the other end.  It is set up like a see saw. 
Añadido al timeline:
fecha:
7 ene 2000 año aC
Ahora mismo
 ~ 4028 years ago 
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