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Dyfyniad Arddull ChicagoLu, Yi. Theoretical and Experimental Studies of a Long Stroke Pumping Unit with an Auto-mechanical Reverse Mechanism and a Sliding Counterweight. Oulu: Oulun yliopisto, 1997.
Dyfyniad MLALu, Yi. Theoretical and Experimental Studies of a Long Stroke Pumping Unit with an Auto-mechanical Reverse Mechanism and a Sliding Counterweight. Oulun yliopisto, 1997.
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