Ingenious Seesaw Hand-pump For School Kids To Pump Water Safely | Teachers at a primary school in eastern Indian came up with an innovative solution for a problem of small students studying
KR20120006729U - Water Pump Using Seesaw - Google Patents
Seesaw Water Pumping Sys | PDF
Span Pumps Pvt Ltd on X: "Joy pump - an innovative concept of pumping water from a bore-well. The technology is the same as the hand pump mechanism, making it very easy
See-saw water pump for irrigation, Madras, India - Digital Collections - National Library of Medicine