परिचय
पंप जैक - तेल डेरिक का एक इंटरैक्टिव 3D मॉडल।
अतिरिक्त संसाधन
https://en.wikipedia.org/wiki/Pumpjack
https://sciencing.com/oil-derrick-pumps-work-5397576.html
https://sciencing.com/do-oil-field-pumps-work-5557828.html
https://energyhq.com/2018/03/pumpjacks-we-see-them-everywhere-but-how-do-they-work