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JB Rod Pumping Unit

Name: JB Rod Pumping Unit | Videos | Gan Jing World
Uploaded: 2023-11-16T22:39:21.080Z
Duration: 39 s
Description: Very curious and ingenious! Saving many tons of steel because of double-function Motor&Gearbox - counterweight... But, I'm curious to know what will happen when... | Videos | Gan Jing World